To avoid pain we must know the conditions of health. For the accomplishment of this end we must rely upon investigation instead of faith, upon labor in place of prayer. Most misery is produced by ignorance. Passions sow the seeds of pain.

In the search for truth - that everything in nature seems to hide - man needs the assistance of all his faculties. All the senses should be awake.

Sacred are the lips from which has issued only truth.

Martyrdom, as a rule, establishes the sincerity of the martyr, never the correctness of his thought. Things are true or false in themselves.

The old lady who said there must be a devil, else how could they make pictures that looked exactly like him, reasoned like a trained theologian - like a doctor of divinity.

Do not trust those in whom the compulsion to punish is strong.

Every church that has a standard higher than human welfare is dangerous.