Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a God because, if there be one, he must more approve of the homage of reason, than that of blindfolded fear.

I have no fear that the result of our experiment will be that men may be trusted to govern themselves without a master.

There is not a truth existing which I fear... or would wish unknown to the whole world.

My only fear is that I may live too long. This would be a subject of dread to me.

Leave all the afternoon for exercise and recreation, which are as necessary as reading. I will rather say more necessary because health is worth more than learning.