Most men use their knowledge only under guidance from others because they lack the courage to think independently using their own reasoning abilities. It takes intellectual daring to discover the truth.

Genius is the ability to independently arrive at and understand concepts that would normally have to be taught by another person.

Dare to know! Have the courage to use your own intelligence!

In man (as the only rational creature on earth) those natural capacities which are directed to the use of his reason are to be fully developed only in the race, not in the individual.

It is presumed that there exists a great unity in nature, in respect of the adequacy of a single cause to account for many different kinds of consequences.

Reason should investigate its own parameters before declaring its omniscience.

It is often necessary to make a decision on the basis of knowledge sufficient for action but insufficient to satisfy the intellect.