Viṣṇujana: Prabhupāda? Is the samādhi which is the perfection of this eightfold yoga system the same as the samādhi of bhakti-yoga?
Prabhupāda: Yes. Samādhi means to absorb the mind with Viṣṇu. That is samādhi. So if you absorb your mind with Kṛṣṇa, then it is samādhi.
Any inquiry? He'll ask. All right.
Young boy devotee: Swāmījī? You said that if you eat too much you will pay. But how about the devotees? How about when they eat too much prasāda?
Prabhupāda: You want to eat more?
Young boy devotee: I just want to know how.
Prabhupāda: You think you are eating more? So you can eat more. Yes, you can eat more. Yes, it is medical advice that there are two kinds of mistakes in eating—over-eating and under-eating. So under-eating mistake for old man is very good. And over-eating mistake for boys, that is good. So you can overeat. I cannot.
Young boy devotee: How about Tamāla and Viṣṇujana? (laughter)
Prabhupāda: He cannot. You can. You can eat as much as you like. Free pass. (laughter) Yes?
Viṣṇujana: Prabhupāda? In the material world there are instruments to measure different kinds of energy. How does one measure . . . what kind of instrument, how does he develop it, to measure the spiritual energy?
Prabhupāda: Material energy, your question is, just like energy in electricity?
Viṣṇujana: We can measure that with certain instrument. But what is the instrument for measuring Kṛṣṇa's spiritual energy?
Prabhupāda: That instrument you have got—this mṛdaṅga and the cymbal. Just vibrate. It is very simple instrument. The instrument is your tongue. Chant Hare Kṛṣṇa. You have got the . . . everyone has got; you haven't got to purchase. The instrument is your ear. Simply hear vibration. You have got all the instruments with you.
You haven't got to purchase or hire from anywhere. You have got the tongue and you have got the ear. Chant Hare Kṛṣṇa and use this instrument to hear. Finished. All perfection is there. It doesn't require to be educated scientists and philosopher, this or that. Nothing. Simply you chant Hare Kṛṣṇa and hear. Everything is there.
Everyone has got these instruments. You haven't got to pay any tax. You use electrical energy, you have to pay for it. But here you have got everything complete. Pūrṇam idaṁ pūrṇam adaḥ (Īśopaniṣad, Invocation).
Everything created by God is complete. Don't you see this earth? Take the aggregate existence of this earth. It is complete. Now there is sufficient water stock in the sea and oceans. The sunlight is acting, evaporating the water, and it is turned into cloud. Then it is overcast all over the land and there is production. And there is river flowing down. You stock your water tank high, and there are mountain heads, there is stock of water, and all year the river is flowing, supply water.
Don't you see how nice brain it is? Can you pour water, hundred . . .? If you want to evaporate hundred gallons of water, you have got to make so many necessary arrangement. And here, millions of tons water is taken away immediately from the ocean and sea and turned into cloud, light cloud, so that it may not fall down immediately. You see? Not like a tank. And it is reserved on the head of the mountain and it is sprayed all over the land. So everything is there. You require water to produce grains, vegetables. So everything is there.