There are foods which make you more earth-rooted; there are foods which make you more sky-oriented. There is a way of living where you are more in the influence of gravitation; there are ways of living where you become more available to the opposite phenomenon of levitation.
There are two laws: one is gravitation, another is grace. Gravitation pulls you down; grace pulls you up. Science knows only gravitation; yoga knows grace also. And yoga seems to be more scientific about it than science itself because every law must have an opposite. If the earth pulls you down there must be something which is pulling you up also; otherwise the earth would have pulled you completely pulled you in – you would have disappeared. You exist on the surface of the earth. That means there exists a balance between the law pulling you down and the law pulling you up. Otherwise you would have been destroyed by the earth long before – you would have gone back into the womb of the earth and disappeared. But you exist. There is a balance between the opposites, and every law is possible only if the other, the opposite, exists. The name of the opposite law is “grace.”
You may have felt sometimes, unknowingly, one day in the morning, suddenly, you feel light. Hmm?…as if you can fly. You walk on the earth, but your feet are not falling on the earth – you are so weightless, featherlike. And someday you are so heavy, so burdened, that you cannot even walk. What is happening? Then you have to analyze your whole style of life.
Something helps you to be light, and something helps you to be heavy. All that makes you heavy is impure, and all that makes you light is pure. Purity is weightless; impurity is heavy and burdened. A healthy man feels light, weightless; an unhealthy man feels too much burdened by the earth, too much pulled down. A healthy man does not walk; really, he runs. An unhealthy man: even if he sits he is not sitting, he is sleeping.
Yoga knows three words, three gunas: sattva, rajas, tamas. Sattva is purity; rajas is energy; tamas is heaviness, darkness. What you eat makes your body and, in a certain sense, makes you. If you eat meat you will be more heavy. If you just live on milk and fruits you will be light. Have you observed sometimes being on a fast how weightless you feel, as if the whole weight of the body has disappeared? If you stand on a measuring machine it will show your weight, but you don’t feel it. What has happened? The body has nothing to digest; the body is freed from the day-to-day routine. The energy is flowing, the energy has no work to do – it is a holiday for the body. You feel relaxed; you feel beautiful.