The author of Caitanya-caritāmṛta, Kṛṣṇadāsa Kavirāja Gosvāmī, was an inhabitant of Vṛndāvana and a great devotee. He had been living with his family in Katwa, a small town in the district of Burdwan in Bengal. His family also worshiped Rādhā-Kṛṣṇa, and once when there was some misunderstanding amongst his family about devotional service, Kṛṣṇadāsa Kavirāja was advised by Nityānanda Prabhu in a dream to leave home and go to Vṛndāvana. Although he was very old, he started out that very night and went to live in Vṛndāvana. While he was there, he met some of the Gosvāmīs, principal disciples of Lord Caitanya Mahāprabhu. He was requested to write Caitanya-caritāmṛta by the devotees of Vṛndāvana. Although he began this work at a very old age, by the grace of Lord Caitanya he finished it. Today it remains the most authoritative book on Caitanya's philosophy and life.
(Teachings of Lord Caitanya).

Lord Śrī Kṛṣṇa Himself, as Lord Caitanya, again appeared to teach the fallen souls of this material world the way to approach Lord Kṛṣṇa. The Bhagavad-gītā teaches that one should give up everything and be done with this world of material attachment. A pure devotee of Lord Kṛṣṇa and one who follows the philosophy of Lord Caitanya are one and the same. Caitanya's philosophy is that one should give up everything and worship God, Kṛṣṇa. Kṛṣṇa, as the Supreme Lord, the Personality of Godhead, spoke the same words, indicating Himself as the Supreme Lord. However, the Māyāvādī philosophers misunderstood Him. Therefore Lord Caitanya, to clarify the situation, reiterated Lord Kṛṣṇa's message: One should not declare himself to be as good as Kṛṣṇa but should worship Kṛṣṇa as the Supreme Lord.
(Teachings of Lord Caitanya).

The Lord knows everything directly and indirectly, and He is cognizant of all the minute details of everything. He is fully independent as well. He can be compared to a gold mine, and the cosmic creations can be compared to ornaments made from that gold, such as gold rings, necklaces, etc. The gold ring and necklace are qualitatively one with the gold in the mine, but quantitatively the gold in the mine and the gold in the earring or necklace are different. Lord Caitanya's philosophy of the Absolute Truth centers about the fact that the Supreme Lord is simultaneously one with and different from His creation. Nothing is absolutely equal to the Absolute Truth, but at the same time nothing is independent of it.
(Teachings of Lord Caitanya).

Logic and argument are very poor in spiritual strength and always imperfect when applied to spiritual understanding. By putting forward mundane logic one frequently comes to the wrong conclusion regarding the Absolute Truth, and as a result of such a conclusion one may fall down to accept a body like that of a jackal. Despite all this, those who are actually inquisitive to understand the philosophy of Śrī Caitanya Mahāprabhu through logic and argument are welcome. Kṛṣṇadāsa Kavirāja Gosvāmī addresses them, "Please put Śrī Caitanya Mahāprabhu's mercy to your crucial test, and if you are actually a logician you will come to the right conclusion that there is no personality more merciful than Lord Caitanya." Let the logicians compare all the results of other humanitarian work with the merciful activities of Lord Caitanya. If their judgment is impartial, they will understand that no other humanitarian activities can surpass those of Śrī Caitanya Mahāprabhu.
(Sri Caitanya Caritamrta------1:8:15------purport).

It is the mission of Śrī Caitanya Mahāprabhu to act Himself and teach the people. He says, āpani ācari' bhakti karila pracāra (CC.1:4:41). One must first act himself and then teach. This is the function of a real teacher. Unless one is able to understand the philosophy that he speaks, it will not be effective. Therefore one should not only understand the philosophy of the Caitanya cult but also implement it practically in one's life.
(Sri Caitanya Caritamrta------1:9:51------purport).

Although spirit and matter ultimately come from the same one source, they cannot be made one. For example, there are many things that come from our bodies, but although they come from the same source, they cannot be made one. We should be careful to note that although the supreme source is one, the emanations from this source should be separately regarded as inferior and superior. The difference between the Māyāvāda and Vaiṣṇava philosophies is that the Vaiṣṇava philosophy recognizes this fact. Śrī CaitanyaMahāprabhu's philosophy, therefore, is called acintya-bhedābheda—simultaneous oneness and difference. For example, fire and heat cannot be separated, for where there is fire there is heat and where there is heat there is fire. Nonetheless, although we cannot touch fire, heat we can tolerate. Therefore, although they are one, they are different.
(Srimad Bhagavatam------10:13:39------purport).

The Lord must be worshiped in His original form as Kṛṣṇa. He can also present Himself in any one of His various expanded energies. When we worship the Deity of the Lord in the temple, the Deity appears to be stone or wood. Now, because the Supreme Lord does not have a material body, He is not stone or wood, yet stone and wood are not different from Him. Thus by worshiping stone or wood we get no result, but when the stone and wood are represented in the Lord's original form, by worshiping the Deity we get the desired result. This is supported by Śrī Caitanya Mahāprabhu's philosophy, acintya-bhedābheda, which explains how the Lord can present Himself everywhere and anywhere in a form of His energy to accept service from the devotee.
(Srimad Bhagavatam------7:15:59------purport).

No one should think himself perfect and forget the śāstric instruction that one should be very careful about associating even with his daughter, mother or sister, not to speak of other women. Śrīla Madhvācārya cites the following ślokas in this regard:
bahutvenaiva vastūnāṁ
yathārtha-jñānam ucyate
advaita-jñānam ity etad
dvaita-jñānaṁ tad-anyathā
yathā jñānaṁ tathā vastu
yathā vastus tathā matiḥ
naiva jñānārthayor bhedas
tata ekatva-vedanam
Unity in variety is real knowledge, and therefore giving up variety artificially does not reflect perfect knowledge of monism. According to the acintya-bhedābheda philosophy of Śrī Caitanya Mahāprabhu, there are varieties, but all of them constitute one unit. Such knowledge is knowledge of perfect oneness.
(Srimad Bhagavatam------7:12:10------purport).

As stated in Bhagavad-gītā (9.10), mayādhyakṣeṇa prakṛtiḥ: material nature is working under the direction of the Lord. Therefore the Lord is not unattached to the external energy, and He is addressed in this verse as guṇa-ātmā, the source of the three modes of material nature. As stated in Bhagavad-gītā (13.15), nirguṇaṁ guṇa-bhoktṛ ca: although the Lord is not attached to the external energy, He is nonetheless the master of it. The philosophy of Lord Caitanya, upholding that the Lord is simultaneously one with and different from His creation (acintya-bhedābheda-tattva), is very easily understandable in this connection. The planet earth explains that although the Lord is attached to the external energy, He is nirdhuta; He is completely free from the activities of the external energy. The Lord is always situated in His internal energy. Therefore in this verse it is stated: svarūpa-anubhavena. The Lord remains completely in His internal potency and yet has full knowledge of the external energy as well as the internal energy, just as His devotee remains always in a transcendental position, keeping himself in the service of the Lord without becoming attached to the material body.
(Srimad Bhagavatam------4:17:29------purport).

How the Lord acts is nicely explained in the Viṣṇu Purāṇa: fire is situated in one place, while the heat and light produced by the fire act in many different ways. Another example given is that the electric powerhouse is situated in one place, but by its energies many different types of machinery move. The production is never identical with the original source of the energy, but the original source of energy, being the prime factor, is simultaneously one with and different from the product. Therefore, Lord Caitanya's philosophy, acintya-bhedābheda-tattva, is the perfect way of understanding. In this material world, the Lord incarnates in three forms—as Brahmā, Viṣṇu and Śiva—by which He takes charge of the three modes of material nature. By His incarnation of Brahmā He creates, as the incarnation of Viṣṇu He maintains, and by. His incarnation of Śiva, He also annihilates. But the original source of Brahmā, Viṣṇu and Śiva—Garbhodakaśāyī Viṣṇu—is always apart from these actions and reactions of material nature.
(Srimad Bhagavatam------4:11:18------purport).

After fulfilling his responsibility to produce a nice child, one should take sannyāsa and engage in the perfectional paramahaṁsa stage. paramahaṁsa refers to the most highly elevated perfectional stage of life. There are four stages within sannyāsa life, and paramahaṁsa is the highest order. The Śrīmad-Bhāgavatam is called the paramahaṁsa-saṁhitā, the treatise for the highest class of human beings. The paramahaṁsa is free from envy. In other stages, even in the householder stage of life, there is competition and envy, but since the activities of the human being in the paramahaṁsa stage are completely engaged in Kṛṣṇa consciousness, or devotional service, there is no scope for envy. In the same order as Kardama Muni, about one hundred years ago, Ṭhākura Bhaktivinoda also wanted to beget a child who could preach the philosophy and teachings of Lord Caitanya to the fullest extent. By his prayers to the Lord he had as his child Bhaktisiddhānta Sarasvatī Gosvāmī Mahārāja, who at the present moment is preaching the philosophy of Lord Caitanya throughout the entire world through his bona fide disciples.
(Srimad Bhagavatam------3:22:19------purport).