Kṛṣṇa says that "A little flower or little water or a little leaf, whatever My devotee offers Me in love and devotion, I accept it." And tad ahaṁ bhakty-upahṛtam: "And because he has brought it with great devotion, therefore I eat." Tad ahaṁ bhakty-upahṛtam aśnāmi. Aśnāmi means "I eat."
Now you can say, "All right, I'll offer these fruits and flowers to God, but it is the same. It is remaining. How He is eating?" But His eating is not like my eating, because He hasn't got a body like this. This body is material. If you bring me a plate of fruits, this body immediately swallows it. But He has got spiritual body. He eats . . . simply as soon as He knows that you have offered it in devotion, He eats immediately.
So these are, I mean to say, technical of understanding, and we can know it from Vedic literatures. Just like in the Vedas it is said, pūrṇasya pūrṇam ādāya pūrṇam evāvaśiṣyate (Īśo Invocation). We cannot imagine. Pūrṇam means full. If you take full from the full, still, the balance is full. That is the spiritual calculation. Just like if you have got hundred dollars and I take hundred dollars from you, still you have got hundred dollars. This is beyond material conception. Here, one minus one equal to zero, and in the spiritual world, one minus one equal to one. Here one plus one equal to two, and in the spiritual world, one plus one equal to one.