Upon the progress of knowledge the whole progress of the human race is immediately dependent: he who retards that, hinders this also.

Humanity may endure the loss of everything; all its possessions may be turned away without infringing its true dignity - all but the possibility of improvement.

We do not act because we know, but we know because we are called upon to act; the practical reason is the root of all reason.

To those who do not love God, all things must work together immediately for pain and torment, until, by means of the tribulation, they are led to salvation at last.

My mind can take no hold on the present world, nor rest in it a moment, but my whole nature rushes onward with irresistible force towards a future and better state of being.

A man can do what he ought to do; and when he says he cannot, it is because he will not.

The person who doubts there is an external world does not need proof: he needs a cure.