You cannot manufacture this nice fruit. It is not in your power. You may be very much expert in conducting a big factory for manufacturing these motorcars, but it is not possible for you to manufacture these nice grapes or oranges or banana or rice. No. That is not in your power. Therefore a sane man should admit that "This is sent by God." This is common sense. What is beyond your power . . . if you say it is product of nature . . . what do you mean by "nature"? Nature means an energy which is acting under the direction of God. That is nature.
That is explained in the Bhagavad-gītā: mayādhyakṣeṇa prakṛtiḥ sūyate sa-carācaram (BG 9.10). Prakṛti means nature. Don't take that the nature is producing without the active cooperation of the Supreme Lord, puruṣa. Just like when a woman has got a child, produced a child, you must know that she had connection with a man, the puruṣa. So it is common sense.
So this offering of foodstuff to the Deity, Kṛṣṇa, or God, is very nice. "My Lord, You have given me so nice foodstuff to eat, so You first of all taste, and then we shall take." It is a gratitude. You haven't got even any gratitude to express. In the Bhagavad-gītā it is said, stena eva sa ucyate (BG 3.12). Anyone who does not offer foodstuff to the Personality of Godhead, he is thief. He is thief. And yajña-śiṣṭāśinaḥ santo mucyante sarva-kilbiṣaiḥ. And if you take foodstuff offered to the Deity, then you get rid of all sinful activities. Mucyante sarva-kilbiṣaiḥ and bhuñjate te tv aghaṁ pāpā ye pacanty ātma-kāraṇāt (BG 3.13). Ātma-kāraṇāt means self satisfaction or sense gratification.