The process of devotional service—beginning with chanting and hearing—is called sādhana-bhakti. This includes the regulative principles that are intended to awaken one to devotional service. Devotional service is always dormant in everyone's heart, and by the offenseless chanting of the holy names of the Lord, one's original dormant Kṛṣṇa consciousness is awakened. This awakening to Kṛṣṇa consciousness is the beginning of sādhana-bhakti. This can be divided into many different parts, including faith, association with devotees, initiation by the spiritual master, engagement in devotional service under the instructions of a spiritual master, steadiness in devotional service and the awakening of a taste for devotional service. In this way, one can become attached to Kṛṣṇa and His service, and when this attachment is intensified, it results in ecstatic love for Kṛṣṇa.
(Sri Caitanya Caritamrta----2:19:177----purport).

Śrīla Bhaktivinoda Ṭhākura explains this point. Is this bhāgya (fortune) the result of an accident or something else? In the scriptures, devotional service and pious activity are considered fortunate. Pious activities can be divided into three categories: pious activities that awaken one's dormant Kṛṣṇa consciousness are called bhakty-unmukhī sukṛti, pious activities that bestow material opulence are called bhogonmukhī sukṛti, and pious activities that enable the living entity to merge into the existence of the Supreme are called mokṣonmukhī sukṛti. These last two awards of pious activity are not actually fortunate. Pious activities are fortunate when they help one become Kṛṣṇa conscious. The good fortune of bhakty-unmukhī is attainable only when one comes in contact with a devotee. By associating with a devotee willingly or unwillingly, one advances in devotional service, and thus one's dormant Kṛṣṇa consciousness is awakened.
(Sri Caitanya Caritamrta----2:22:45----purport).

The understanding of Kṛṣṇa consciousness is innate in every living entity, and it is already developed to some extent when the living entity takes a human body. It is said in Caitanya-caritāmṛta (CC.2:22:107):
nitya-siddha kṛṣṇa-prema 'sādhya' kabhu naya
śravaṇādi-śuddha-citte karaye udaya
"Pure love for Kṛṣṇa is eternally established in the hearts of living entities. It is not something to be gained from another source. When the heart is purified by hearing and chanting, the living entity naturally awakens." Since Kṛṣṇa consciousness is inherent in every living entity, everyone should be given a chance to hear about Kṛṣṇa. Simply by hearing and chanting—śravaṇaṁ kīrtanam (S.B.7:5:23)—one's heart is directly purified, and one's original Kṛṣṇa consciousness is immediately awakened. Kṛṣṇa consciousness is not artificially imposed upon the heart, it is already there. When one chants the holy name of the Supreme Personality of Godhead, the heart is cleansed of all mundane contamination.
(Nectar of Instruction).

Spontaneous loving service to the Lord is called devotional service with an intimate attachment between the servitor and the served. This intimacy is called mamatā. Between the servitor and the served there is a feeling of oneness. This mamatā begins with dāsya-prema, service rendered to the master by the servant. Unless there is such a relationship, the loving affairs between the Lord and His devotee are not actually fixed. When the devotee feels "The Lord is my master" and renders service unto Him, Kṛṣṇa consciousness is awakened. This fixed consciousness is on a higher platform than simple cognizance of love of Godhead.
(Sri Caitanya Caritamrta----2:8:71----purport).

By serving the Lord, one's senses are gradually purified. The engagement of one's purified senses in the service of Lord Hṛṣīkeśa is called bhakti. When the dormant propensity for bhakti is awakened, one can understand the Supreme Personality of Godhead as He is. Bhaktyā mām abhijānāti yāvān yaś cāsmi tattvataḥ. (B.G.18:55) This is the process of giving humanity the chance to awaken Kṛṣṇa consciousness. Thus people can perfect their lives in all respects.
(Sri Caitanya Caritamrta----2:4:102----purport).

When a living entity forgets his constitutional position, he prepares himself to be an enjoyer of the material resources. Sometimes he is also misguided by the thought that service to the Supreme Personality of Godhead is not absolute engagement. In other words, he thinks that there are many other engagements for a living entity besides the service of the Lord. Such a foolish person does not know that in any position he either directly or indirectly engages in activities of service to the Supreme Lord. Actually, if a person does not engage in the service of the Lord, all inauspicious activities encumber him because service to the Supreme Lord, Lord Caitanya, is the constitutional position of the infinitesimal living entities. Because the living entity is infinitesimal, the allurement of material enjoyment attracts him, and he tries to enjoy matter, forgetting his constitutional position. But when his dormant Kṛṣṇa consciousness is awakened, he no longer engages in the service of matter but engages in the service of the Lord. In other words, when one is forgetful of his constitutional position, he appears in the position of the lord of material nature. Even at that time he remains a servant of the Supreme Lord, but in an unqualified or contaminated state.
(Sri Caitanya Caritamrta----1:6:85----purport).

As soon as a devotee sees something—be it movable or inert—he immediately remembers Kṛṣṇa. An advanced devotee is advanced in knowledge. This knowledge is very natural to a devotee, for he has already read in the Bhagavad-gītā how to awaken Kṛṣṇa consciousness. According to Lord Kṛṣṇa in the Bhagavad-gītā (7.8):
raso ’ham apsu kaunteya prabhāsmi śaśi-sūryayoḥ
praṇavaḥ sarva-vedeṣu śabdaḥ khe pauruṣaṁ nṛṣu
"O son of Kuntī (Arjuna), I am the taste of water, the light of the sun and the moon, the syllable oṁ in the Vedic mantras; I am the sound in ether and ability in man."
Thus when a devotee drinks water or any other liquid, he immediately remembers Kṛṣṇa. For a devotee there is no difficulty in awakening Kṛṣṇa consciousness twenty-four hours a day. Caitanya Mahāprabhu therefore says here:
sthāvara jaṅgama dekhe nā dekhe tāra mūrti
sarvatra haya nija iṣṭa-deva-sphūrti
(CC.2:8:274)
A saintly person, an advanced devotee, sees Kṛṣṇa twenty-four hours a day and nothing else. As far as movable and inert things are concerned, a devotee sees them all as transformations of Kṛṣṇa's energy.
(Sri Caitanya Caritamrta----2:8:274----purport).