Lord Caitanya said that one who is master in the science of Kṛṣṇa consciousness, regardless of his social position, is the real spiritual master.
(Bhagavad-Gita------2:8------purport).

Lord Caitanya says that one should always try to associate with saintly persons because if one establishes a proper association with a saintly person, even for a moment, one attains all perfection. Somehow or other, if one meets a saintly person and achieves his favor, then the entire mission of one's human life is fulfilled.
(Srimad Bhagavatam------3:22:5-------purport).

Lord Caitanya says that the living entities, bound up by fruitive activities, are wandering in this way throughout the whole universe, and if by some chance or by pious activities they get in touch with a bona fide spiritual master, by the grace of Kṛṣṇa, then they get the seed of devotional service. After getting this seed, if one sows it within his heart and pours water on it by hearing and chanting, the seed grows into a big plant, and there are fruits and flowers which the living entity can enjoy, even in this material world. That is called the brahma-bhūta stage. In his designated condition, a living entity is called materialistic, and upon being freed from all designations, when he is fully Kṛṣṇa conscious, engaged in devotional service, he is called liberated.
(Srimad Bhagavatam------3:31:43-------purport).

Lord Caitanya said that a teacher should behave properly before he begins teaching. One who teaches in that way is called ācārya, or the ideal teacher. Therefore, a teacher must follow the principles of śāstra (scripture) to teach the common man.
(Bhagavad-Gita------3:21------purport).

Lord Śrī Caitanya says that in the Vedas the subject matters are only three, namely to establish the relation of the living entities with the Personality of Godhead, perform the relative duties in devotional service and thus achieve the ultimate goal, back to Godhead.
(Srimad Bhagavatam------1:5:24-------purport).

Lord Caitanya says that simply by chanting the holy name of the Lord one can at once wash off the dust on the mirror of pure consciousness, and as soon as the dust is removed, one is at once freed from all material conditions. To become free from material conditions means to liberate the soul. As soon as one is, therefore, situated in absolute knowledge, his material conception of life is removed, or he emerges from a false conception of life. Thus the function of the pure soul is revived in spiritual realization.
(Srimad Bhagavatam------1:5:31-------purport).

Lord Caitanya says that the living entity is eternally a servitor of the Supreme Personality of Godhead, Śrī Kṛṣṇa. Therefore, every living entity has a particular type of service relationship with the Lord, eternally. This particular attachment is invoked by practice of regulative devotional service to the Lord, and thus the devotee becomes attached to the eternal form of the Lord, exactly like one who is already eternally attached.
(Srimad Bhagavatam------3:9:11-------purport).

One of His personal associates, namely Choṭa Haridāsa, was associated with Lord Caitanya along with His other confidential personal associates, but somehow or other this Choṭa Haridāsa looked lustily on a young woman, and Lord Caitanya was so strict that He at once rejected him from the society of His personal associates. Lord Caitanya said, "For a sannyāsī or anyone who is aspiring to get out of the clutches of material nature and trying to elevate himself to the spiritual nature and go back home, back to Godhead, for him, looking toward material possessions and women for sense gratification—not even enjoying them, but just looking toward them with such a propensity—is so condemned that he had better commit suicide before experiencing such illicit desires." So these are the processes for purification.
(Bhagavad-Gita------16:1-3------purport).

Lord Caitanya said:
bhārata-bhūmite haila manuṣya-janma yāra
janma sārthaka kari' kara para-upakāra
Everyone born in India, especially as a human being, can achieve the supreme success through the Vedic literature and its practical application in life. When one is perfect, he can render a service for the self-realization of the entire human society. This is the best way to perform humanitarian work.

(Srimad Bhagavatam------6:16:58-------purport).

Lord Caitanya says in His Śikṣāṣṭaka (3):
tṛṇād api su-nīcena taror iva sahiṣṇunā
amāninā māna-dena kīrtanīyaḥ sadā hariḥ
(CC.1:17:31)
"One can chant the holy name of the Lord in a humble state of mind, thinking himself lower than the straw in the street. One should be more tolerant than a tree, devoid of all sense of false prestige, and should be ready to offer all respect to others. In such a state of mind one can chant the holy name of the Lord constantly."

(Sri Caitanya Caritamrta------1:10:85------purport).

Lord Caitanya said that His spiritual master told Him: "It is very good that You have attained such a perfectional stage of love of Godhead. Because of Your attainment, I am very much obliged to You." The father becomes enlivened when he sees his son advance beyond himself. Similarly, the spiritual master takes more pleasure in seeing his disciple advance than in advancing himself. Thus Lord Caitanya's spiritual master blessed Him, telling Him: "Dance, sing, propagate this saṅkīrtana movement and, by instructing people about Kṛṣṇa, try to deliver them from nescience." Lord Caitanya's spiritual master also taught Him the following very nice verse from Śrīmad-Bhāgavatam (11.2.40):
evaṁ-vrataḥ sva-priya-nāma-kīrtyā
jātānurāgo druta-citta uccaiḥ
hasaty atho roditi rauti gāyaty
unmāda-van nṛtyati loka-bāhyaḥ
"A person who constantly engages in devotional service to Kṛṣṇa by chanting His holy name becomes so transcendentally attached to the chanting that his heart becomes softened without extraneous endeavor. When this happens, he exhibits transcendental ecstasies by sometimes laughing, sometimes crying, sometimes singing and sometimes dancing—not exactly in an artistic way, but just like a madman."

(Teachings of Lord Caitanya).

In Caitanya-caritāmṛta Lord Caitanya says that sādhu-saṅga,- the association of a great saintly person, is very important, because even if one is not advanced in knowledge, simply by association with a great saintly person one can immediately make considerable advancement in spiritual life.
(Bhagavad-Gita------3:23:54------purport).