"To rule by fettering the mind through fear of punishment in another world is just as base as to use force."

"Men will fight for superstition as quickly as for the living truth—even more so, since superstition is intangible and cannot be reached."

"The only way to wisdom is through fearless questioning."

"Reserve your right to think, for even to think wrongly is better than not to think at all."

"Truth does not change because it is, or is not, believed by a majority of the people."