This our process is ādau gurvāśrayam (Bhakti-rasāmṛta sindhu). To accept this Kṛṣṇa consciousness movement means first of all to accept guru. Ādau gurvāśrayam. Sad-dharma-pṛcchāt. Then inquiry from guru. The disciple should be intelligent enough to inquire from the spiritual master how to become advanced. So to become advanced means sādhu mārganu-gamanam, to follow the ācāryas. That is also confirmed in the Bhagavad-gītā: ācārya-upāsanam (BG 13.8). Ācārya. Our this Vedic principle is to follow the ācārya. And if we have taken shelter of a bona fide ācārya, and if we are sincere to follow the instruction of ācārya, then our life is successful. This is the process, ācārya upasanam.
So this initiation means the beginning of ācārya upasanam. Just like Arjuna submitted to Kṛṣṇa when he was puzzled whether he would fight or not. Then he took shelter of Kṛṣṇa as guru. Kṛṣṇa was with him, but He was like friend. So friendly talks sometime does not become very serious. But talks between the spiritual master and disciple is serious. A friend can deny to accept the instruction of the other friend, but a disciple cannot deny. That will be guror avajñā (Padma Purāṇa). Therefore Arjuna submitted himself, that "Now I become Your disciple. You guide me." Śiṣyas te 'haṁśādhi māṁ tvāṁ prapannam (BG 2.7): "I become Your disciple; kindly instruct me. I am fully surrendered to You." So this is, initiation means . . . meaning . . . regular meaning is also, initiation, "something to begin." This is beginning of spiritual life.