Indra and the Father-god exist, just as men exist, as transient forms of _brahma_.

Therefore, according to the weakness or strength of a man's mind and heart (desire) is he fitted to ignore gods and sacrifice.

To obtain _brahma_ his desires must be weak, his knowledge strong; but sacrifice is not to be put away as useless.

The disciplinary teaching of the sacrifice is a necessary preparation for highest wisdom.

It is here that the Upanishads, which otherwise are to a great extent on the highway to Buddhism, practically contrast with it.