Time, essential nature, necessity, chance, essence—these are primary elements, but only their favorable or unfavorable combination becomes the cause of happiness or unhappiness. The root of happiness lies in self-knowledge and ascetic practice. 66. What do I call supreme? The wind blows with truth, the sun shines with truth, truth is the foundation of speech, and everything is founded on truth. Therefore, truth is called supreme. Through ascetic practice, the gods attain divinity in the beginning. Everything is founded on ascetic practice. Therefore, ascetic practice is called supreme.
Upanishads
Upanishads