It is the man and woman united that makes the complete human being. Separate she lacks his force of body and strength of reason; he her softness, sensibility and acute discernment. Together they are most likely to succeed in the world.

Let thy discontents be thy secrets

We can defer, yet time is most certainly not.

If everyone is thinking alike, then no one is thinking.

Some volumes against Deism fell into my hands ... they produced an effect precisely the reverse to what was intended by the writers; for the arguments of the Deists, which were cited in order to be refuted, appeared to me much more forcibly than the refutation itself; in a word, I soon became a thorough Deist.

The rapid progress of the sciences makes me sorry, at times, that I was born so soon. Imagine the power that man will have over matter, a few hundred years from now. We may learn how to remove gravity from large masses, and float them over great distances. Agriculture will double its produce with less labor. All diseases will surely be cured... even old age. If only the moral sciences could be improved as well. Perhaps men would cease to be wolves to one another... and human beings could learn to be human.

Distrust and caution are the parents of security.