Belief is not the beginning of knowledge - it is the end.

He loves not who does not see the faults of the beloved as virtues.

When I consider the narrow limits within which our active and inquiring faculties are confined; when I see how all our energies are wasted in providing for mere necessities, which again have no further end than to prolong a wretched existence; and then that all our satisfaction concerning certain subjects of investigation ends in nothing better than a passive resignation... when I consider all this... I am silent.

America, you have it better than our continent, the old one.

As soon as any one belongs to a narrow creed in science, every unprejudiced and true perception is gone.

Talents are nurtured best in solitude, But character on life's tempestuous seas!

Difficulties increase the nearer we get to the goal.