Tapasya means voluntarily agree to suffer. That is called tapasya. Voluntarily. Suffering is there, but why not suffer for Kṛṣṇa? Everyone is unhappy. Everyone is in suffering condition. Who is not suffering? Everyone is suffering. Tri-tāpa-yatana. Adhyātmika, adhibhautika, adhidaivika. Three kinds of sufferings are always going on. Why you are running fan? Because suffering; there is heat. So where is no suffering? This is called adhidaivika, the scorching heat, scorching, I mean, severe cold. There must be always. We are suffering now due to scorching heat, and when the . . . we are thinking, "If it is become cooler . . ." And when it is cool, then also we suffering. Then we think, "If there is some heat." When there is winter, we are hankering after heat, and when there is summer, we are hankering after cooling.
So this is going on. We cannot be happy. First of all we must know that. There is no question of happiness here. We are simply hankering, "If it would have been very nicely cool." And when it is cool, then you'll think, "If it had been nicely hot . . ." The same thing. Carvita-carvaṇānām. Carvita-carvaṇānām means chewing the chewed. We have tasted heat and cold both, but we are desiring, "If it would have been like this, if it had been like that, if it . . ." But never come to the conclusion that either heat or cool, we have to suffer. Mātrā-sparśās tu kaunteya. That is explained by Kṛṣṇa. So long you have got this, this material skin, then this heat and cold you'll have to suffer. Mātrā-sparśās tu kaunteya śītoṣṇa-sukha-duḥkha-dāḥ (BG 2.14). The śīta, the summer, the winter, or the summer season, neither of them are sources of happiness. But you are thinking like that. "If it would have been like this, if it would have been like this."