A selection from the book The Bhagavad Gita for Awakening,
available for reading online, as a free PDF download, or as a paperback or ebook.
Tapasya is practical (i.e., result-producing) spiritual discipline. Literally it means the generation of heat or energy, referring to spiritual practice and its effect, especially the “roasting” of karmic seeds, the “burning up” of karma. It also refers to the heat necessary for the hatching of an egg. Without tapasya there is no significant spiritual progress. So Krishna tells us of three levels of tapasya as well as its characterization according to the dominant guna of the persons engaging in tapasya..
Tapasya of the body
“Reverence for the devas, the seers, the teachers and the sages; straightforwardness, harmlessness, physical cleanliness and sexual purity; these are the virtues whose practice is called austerity of the body.” (Bhagavad Gita 17:14)
Reverence (pujanam) is internal, so why does it come first in the list of physical austerity? Because Krishna is not thinking of mere philosophizing or abstraction–in other words, empty words. He is thinking of action, of kriya, which creates positive karma in the form of purification and enlightenment. Puja is the word usually translated “worship,” and some translators use it rather than reverence. Worship in Krishna’s view is not mere verbal praise or glorification, but a living out of the interior attitude of reverence.
As Jesus once asked: “Why call ye me, Lord, Lord, and do not the things which I say?” (Luke 6:46) So to reverence a spiritual authority is not to flatter, grovel, and promote them or shower them with money and gifts. Rather, it is faithfully and seriously applying their teachings. Krishna speaks of four kinds who deserve our reverence: devas, seers, teachers, and sages.
Devas are gods–not the Supreme God, but highly evolved beings who can affect our life. We might think of them as angels or saints, bodiless beings that interact with humans and help them in many ways. All viable religions have some form of devas.
The dwijas (seers) are the “twice-born.” Often this term applies to those who have undergone the upanayanam ritual and received instruction in the Gayatri mantra, but here a wider sense is meant.