Prabhupāda: . . . to God it is the king of all knowledge, rāja-vidyā. Because it is our constitutional position, normal life, to serve Kṛṣṇa. We are part and parcel of Kṛṣṇa. Just like part and parcel of my body—what they are meant for? Just like this finger is the part and parcel of my body. And what is the business of the finger? The business of the finger is to serve this whole body. Now, I have got some pain in this finger, so it is not working—abnormal condition. Normal condition, there is all right. This is normal condition: as soon as I say: "Finger, please come here; do like this," it will do it. And abnormal condition: there is some pain; I cannot use it.
So the conclusion is, we living entities, we being part and parcel of God, Kṛṣṇa, our only business is to serve Kṛṣṇa. We have no other business. As soon as we are engaged in other business, that is our abnormal condition. That is not normal condition. Just like this finger is not serving me, but it is serving some medicine from doctor, from the other, so that service is not very palatable. If any part of my body is engaged in service . . . in giving service to the physician, that is not very palatable. But in healthy condition, when the parts and parcels of the body give service to the healthy body, that is very nice. That is pleasing.