Upanishads

Chandogya: Chapter 8.4.1: "There is a bridge between time and Eternity; and this bridge is Atman, the Spirit..."
Prasna: First Question, Verses 3-5: "When the time came, Kabandhi Katyayana aproached the sage and said: Master, whence came all..."
Mundaka: Mantra II.2:10: "There the sun shines not, nor the moon, nor the stars; lightnings shine not there..."
Chandogya: Verse 1.9.1: "Wherefrom do all these worlds come? They come from space [monad]. All beings arise from..."

The Upanishads are a collection of Vedic texts which contain the earliest formulations of central religious concepts from Hinduism, Buddhism and Jainism. The Upanishads are considered by Hindus to contain revealed truths (Sruti) concerning the nature of ultimate reality (brahman) and describing the character and form of human salvation (moksha). The Upanishads are found mostly in the concluding part of the Brahmanas and Aranyakas and have been passed down in oral tradition.