Mother language means

Expressions researched:
"means if the child is handed over to some other person"

Bhagavad-gita As It Is Lectures

"Mother language" means if the child is handed over to some other person whose mother, whose language is different from the mother, he'll learn, from the very beginning he'll learn that language.

Lecture on BG 7.1 -- San Diego, July 1, 1972:

Pradyumna: "The Lord therefore says to Arjuna, tac chṛṇu, or 'Hear from Me.' No one can be a greater authority than Kṛṣṇa, and therefore, by hearing from Him..."

Prabhupāda: There... Here is another point. We have to learn by listening from somebody. Tad-vijñānārthaṁ sa gurum eva abhigacchet (MU 1.2.12). We approach guru for hearing from him the truth. Just like child listens from the parents and he learns to speak, he learns to know what is what. The father says, "This is dish"; the child also says, "This is dish." The father says, "This is spoon"; the child also says, "This is spoon." So he learns by hearing. "Mother language" means if the child is handed over to some other person whose mother, whose language is different from the mother, he'll learn, from the very beginning he'll learn that language.

So hearing is very important. Therefore our bhakti process, bhakti-yoga process is hearing. The more you give aural reception to the transcendental message, more you become expert. You haven't got to become a Ph.D. or very learned fellow, or very scholar. No. Even a child, without any education, he can also become Kṛṣṇa conscious simply by hearing. In New Yor... In Los Angeles, our child friend, he's only three years old. Oh, he cites so many mantras. He has learned. Yes. So many. Of course, one child may be specially intelligent, but anyone can learn. The method is simply hearing and seeing the behavior. You put one child in this association; automatically, with his growth, he'll become a Vaiṣṇava, a Kṛṣṇa conscious devotee. Automatically, by seeing these activities, man-manā bhava mad-bhakto mad-yājī māṁ namaskuru (BG 18.65), by thinking of Kṛṣṇa. Because the child will get the opportunity for hearing the word "Kṛṣṇa, Kṛṣṇa." Everyone has got God-gifted instrument, this ear. And if we give aural reception, we'll learn. There is no need of education, ABCD. No.

So hearing is so important. Śrī Caitanya Mahāprabhu's preaching work... Caitanya Mahāprabhu's, this propaganda of saṅkīrtana movement, He has given stress on this hearing process. Sthāne sthitāḥ śruti-gatāṁ tanu-vāṅ-manobhiḥ. You can remain in your place. We don't say that you change your place. Whatever you are, you remain. If you are American, you remain American. If you are Hindu, you remain a Hindu. If you are Muslim, you remain Muslim. We don't say that first of all you become a Hindu or this or that. No. We simply request, "Please come here, sit down, and hear." That's all. This is the yoga system. Hearing yoga system. We don't say, press, that "You do this, you do that." We say the regulative principle. When one is seriously becoming our intimate friend or member, then we say that "You have to follow the rules and regulations." That he will agree. If he has actually heard our words, then immediately he will agree. It is not very difficult thing.