Although Vāsudeva Vipra was a leper and had suffered greatly, still Śrī Caitanya Mahāprabhu cured him. The only return the Lord wanted was that Vāsudeva preach the instructions of Kṛṣṇa and liberate all human beings. That is the process of the International Society for Krishna Consciousness. Each and every member of this Society was rescued from a very abominable condition, but now they are engaged in preaching the cult of Kṛṣṇa consciousness. They are not only cured of the disease called materialism but are also living a very happy life. Everyone accepts them as great devotees of Kṛṣṇa, and their qualities are manifest in their very faces. If one wants to be recognized as a devotee by Kṛṣṇa, he should take to preaching work, following the advice of Śrī Caitanya Mahāprabhu. Then one will undoubtedly attain the lotus feet of Śrī Kṛṣṇa Caitanya, Lord Kṛṣṇa Himself, without delay.
Śrī Caitanya-caritāmṛta Madhya-līlā 7.148 – Purport
His Divine Grace A.C. Bhaktivedanta Swami Prabhupāda
The name Vāsudevāmṛta-prada is mentioned in the verses composed by Sārvabhauma Bhaṭṭācārya. When a person actually revives his consciousness with thoughts of Kṛṣṇa by the mercy of Śrī Caitanya Mahāprabhu, he revives his spiritual life and becomes addicted to the service of the Lord. Only then can he act as an ācārya. In other words, everyone should engage in preaching, following in the footsteps of Śrī Caitanya Mahāprabhu. In this way one will be very much appreciated by Lord Kṛṣṇa and will quickly be recognized by Him. Actually a devotee of Śrī Caitanya Mahāprabhu must engage in preaching in order to increase the followers of the Lord. By thus preaching actual Vedic knowledge all over the world, one will benefit all mankind.
Śrī Caitanya-caritāmṛta Madhya-līlā 7.153 – Purport
His Divine Grace A.C. Bhaktivedanta Swami Prabhupāda

The authentic account of Lord Caitanya Mahāprabhu’s pastimes and teachings, revealing His mission to spread the purest form of devotional service to Krishna through the chanting of His holy names.