What is String Theory?
Śilaka Śālāvatya asked Pravāhaṇa, ‘What is the end of this earth?’ Pravāhaṇa said: ‘Space, for everything that exists arises from space and also goes back into space. Space is superior to everything. Space is the highest goal’.
Space is described here as the source of everything. It is the source as well as the end of everything. In short, it is Paramātman, the Cosmic Self. Because space is the biggest thing visible, it can rightly claim to be the symbol of the Paramātman. All the other elements (air, fire, water, and earth) come from space and go back to space. But the scriptures also say that the Cosmic Self is the source and the end of the elements—indeed, of everything.
As the spider sends forth and draws in its thread, as plants grow on the earth, as hair grows on the head and the body of a living man-so does everything in the universe arise from the Imperishable.
Brahman expands by means of austerity and from It primal matter is produced; from matter, Prana; from Prana, mind; from mind, the elements; from the elements, the worlds; thence works and from the works, their immortal fruits.
All this is Brahman. Everything comes from Brahman, everything goes back to Brahman, and everything is sustained by Brahman. One should therefore quietly meditate on Brahman. Each person has a mind of his own. What a person wills in his present life, he becomes when he leaves this world. One should bear this in mind and meditate accordingly.
— Chandogya Upanishad 3.14.1
At the approach of the day all manifest objects come forth from the unmanifested, and at the approach of the night they merge again into that which is called the unmanifested.
— Bhagavad Gita 8.18