Everyone is trying to become God. Therefore the whole world is in chaotic condition. If we want to adjust this chaotic condition, then we require the incarnation of God. That is already there. Nāma-rūpe kali kāle kṛṣṇa-avatāra (CC Adi 17.22). This Hare Kṛṣṇa movement is the incarnation of Kṛṣṇa in the form of name. There is no difference. The saṅkīrtana movement which was inaugurated by Śrī Caitanya Mahāprabhu . . . and Śrī Caitanya Mahāprabhu is Kṛṣṇa Himself. So abhinnatvād nāma-nāminoḥ (CC Madhya 17.133). So this Hare Kṛṣṇa movement is not different from Kṛṣṇa or Caitanya Mahāprabhu. So if we take shelter of this holy name of the Lord, Hare Kṛṣṇa, then we shall be saved. Paritrāṇāya sādhūnām (BG 4.8). We shall become sādhu simply by chanting the Hare Kṛṣṇa mantra. Ceto-darpaṇa-mārjanam (CC Antya 20.12).
We are all sādhus, actually, originally, because we are part and parcel of Kṛṣṇa, but in contact with māyā we have become asādhu. Sādhu means who are pure devotees. Bhajate mām ananya-bhāk. That is sādhu. Otherwise there is no sādhu. The so-called sādhu, they are not sādhu. Sādhu means bhajate mām ananya-bhāk. Sādhur eva sa mantavyaḥ, bhajate mām ananya-bhāk (BG 9.30). So by chanting this Hare Kṛṣṇa mantra, even the lowest of the mankind, narādhamā, he can become a sādhu. "What is evidence how one can become sādhu simply by chanting?" Yes. Narottama dāsa Ṭhākura says, pāpī tāpī yata chilo, harināme uddharilo tāra sākṣi jagāi and mādhāi. Just see how Jagāi-Mādhāi became sādhu. Caitanya Mahāprabhu introducing this saṅkīrtana movement, He is making everyone sādhu. This is Kṛṣṇa consciousness movement. Everyone is becoming sādhu. Bhajate mām ananya-bhāk.