This is a talk from the Madhya Khand, chapter one of the Caitanya Bhagavata written by Sri Vrindavan das Thakur
Mahaprabhu starts the sankirtan movement
Mahaprabhu’s students inquired from Him, “What is the definition of ‘dhātu’, verbal roots?” The Lord replied, “They are the energy of Lord Kṛṣṇa. My dear students, I will now explain the aphorisms on verbal roots. Let me see who can refute my explanations!
“There have been many kings with beautiful bodies, decorated with golden ornaments, flower garlands, and sandalwood paste. People say that they are representatives of Lakṣmī, the Goddess of Fortune, and their words are the words of Yamarāja, the presiding demigod of religious principles. Let me explain to you what happens when ‘dhātu’, life, leaves their body.
“Where go the physical beauty, decorations, and power of these kings? Some of their kingly bodies are turned into ashes and others are buried beneath the earth. Lord Kṛṣṇa is present within everybody in the form of His energy, ‘dhātu’. Living entities are attracted to and love this life energy. In this way, they offer their devotion to Him. All other so-called scholars and teachers are very confused. They do not understand the real meaning of ‘dhātu’, verbal roots. So all of you now listen attentively.
“The kingly person, who was for so long worshiped and respected, becomes contaminated as soon as life leaves him; and if his body is touched, one must take a bath. The son who spent happy hours upon the lap of his father must touch fire to the dead father’s mouth and burn his body to ashes. Therefore, the definition of ‘dhātu’, essential substance, is the energy of Lord Kṛṣṇa that is loved by everyone.
“Now I want to see if there is anyone capable of refuting this explanation. The essential energy of Kṛṣṇa is pure, transcendental and worshipable; thus, one should develop unflinching faith and devotion to Lord Kṛṣṇa. Just chant Kṛṣṇa’s names, worship His lotus feet and hear only the names of Lord Kṛṣṇa.
“Spend all of Your time meditating upon the lotus feet of the Lord. Just take shelter of the lotus feet of the son of Nanda Mahārāja, for if one simply worships the lotus feet with a little water, grass or leaf, then the Lord of Death can never approach. Just worship He who has by killing Aghāsura, Bakāsura, and Pūtanā given them liberation.
Ajāmila at the point of death cried out his son’s name Nārāyaṇa. Even after a sinful life, by worshiping the Lord’s lotus feet and remembering the Lord, he gave up attachment for his son and went to the spiritual sky, the Vaikuṇṭha planets.
“Simply take shelter of the supreme lotus feet of Lord Śrī Kṛṣṇa. Lord Śiva and Lakṣmī Devī are always desirous of worshiping those lotus feet. In humility, Lord Ananta Śeṣa eternally glorifies the wonderful mercy of the lotus feet of Lord Kṛṣṇa. As long as there is life within the body, and strength in the limbs and mind, take shelter of devotional service to the lotus feet of Lord Kṛṣṇa. Kṛṣṇa is your mother, Kṛṣṇa is your father, and Kṛṣṇa is your very life and soul. Simply embrace His lotus feet and offer your mind, words, and body completely unto Him.”
Caitanya Bhagavata, Madhya kanda, ch. 1 by Vrindavan das Thakur