Jaya-gopāla: When we engage inferior energy, internal energy, in the service of Kṛṣṇa, it becomes spiritualized, doesn't it?
Prabhupāda: No. When you apply your energy, it is no more material; it is spiritual. Just like when the copper wire is in touch with electricity, it is no more copper; it is electric. So service to Kṛṣṇa means as soon as you dovetail yourself in the service of Kṛṣṇa, you are not different from Kṛṣṇa. That is stated in the Bhagavad-gītā: māṁ ca 'vyabhicāreṇa bhakti-yogena yaḥ sevate. This very word, sevate. Sa guṇān samatītyaitān brahma-bhūyāya kalpate (BG 14.26). "Anyone who seriously engages himself in My service, immediately he becomes transcendental to the material qualities and he's on the platform of Brahman." Brahma-bhūyāya kalpate. So when you apply your energy in the service of Kṛṣṇa, you do not think that your material energy is there. No. Just like these fruits. These fruits, one may think, "What is this prasāda? This fruit has been purchased, we also eat fruit at home, and this is prasāda?" No. Because it is offered to Kṛṣṇa, immediately it is no more material. The result? You eat Kṛṣṇa prasāda and see how you are making progress in Kṛṣṇa consciousness. Just if the physician gives you some medicine and if you get yourself cured, that is the effect of medicine. Another example is that how the material things become spiritual. A very nice example. Just like you have taken a large quantity of milk. So there is some disorder in your bowels. You go to a physician. At least, according to Vedic system of..., they will offer you a preparation which is called yogurt. That is milk preparation. That yogurt with little medicine will cure. Now your disease was caused by milk, and it is cured by milk also. Why? It is directed by the physician. Similarly everything. In the higher sense there is no existence of matter; it is only illusion. Just like this morning I was giving the instance of the sun and the fog. The fog was there; the sun could not be seen. The foolish person will say that "There is no sun. It is simply fog." But intelligent person will say that "Sun is there, but the fog has covered our eyes. We cannot see the sun." Similarly, actually, everything being energy of Kṛṣṇa, there is nothing material. Simply our, this mentality that we want to lord it over, that is false, illusion. That is covering our relationship with Kṛṣṇa. So that you will gradually understand. Sevonmukhe hi jihvādau svayam eva sphuraty adaḥ (Brs. 1.2.234). As you make progress in the service attitude, everything will become cleared, how your energy has become spiritualized.