Reason is and ought only to be the slave of the passions, and can never pretend to any other office than to serve and obey them.
Reason is a prophet, for in showing us the consequence and effect of our actions in the present, it tells us what the future will be.
Reason is as cunning as she is powerful. Her cunning consist principally in her mediating activity, which, by causing objects to act and re-act on each other in accordance with their own nature, in this way, without any direct interference in the process, carries out reason's intentions.
Reason is an illusion that ignores its historical formation in the past, its precariousness in the present, and its fragility in the future.
Reason is as an instrument received directly from God, the sole instrument with which man can come to know himself and to know his relation to the universe.