Suppose one is suffering from some disease and one is very rich man. He engages first-class physician; first-class medicine is being . . . does it mean that his life is guaranteed? No. If Kṛṣṇa does not give him protection, despite all supply of good medical treatment and medicine, he'll die. This is a fact. Similarly, if you have got good, nice boat, it is not guarantee that you'll not drown in the ocean. No. At any moment, if Kṛṣṇa does not give you protection . . . this is our position.
So we may have invented so many counteract . . . counteraction for our protection. That is scientific advancement, struggle for existence. Nature is offering difficulties, and the human beings, so-called scientists, they are trying to invent something to check this difficulty. This is called struggle for existence. But it is not possible. Unless Kṛṣṇa gives you protection, your invention has no use.
So Kuntī knows it. Although Kuntī happens to be the mother of big, big warriors—Arjuna, Bhīma—still she thinks that, "They are not sufficient to give us protection. My sons are so big, big warriors, but that is not protection. Except Yourself . . ." Therefore she says, yeṣāṁ na ca anyat: "It is not that anyone can give us protection except Your lotus feet."
So this is a very nice verse for the surrendered soul seeking the protection of Kṛṣṇa. And if we remain in that position, that our only protector is Kṛṣṇa and our only duty is to serve Kṛṣṇa, then our life is successful.