Act as if what you do makes a difference. It does.
All our scientific and philosophic ideals are altars to unknown gods.
All the higher, more penetrating ideals are revolutionary.
As a rule we disbelieve all the facts and theories for which we have no use.
Compared with what we ought to be, we are only half-awake.
First,...a new theory is attacked as absurd; then it is admitted to be true, but obvious and insignificant; finally it is seen to be so important that its adversaries claim that they themselves discovered it.
Freedom is only necessity understood.
In the practical use of our intellect, forgetting is as important a function as recollecting.
Live by yes and no—yes to everything good, no to everything bad.
My first act of free will shall be to believe in free will.
Nothing is so fatiguing as the eternal hanging on of an uncompleted task.
That nature will follow tomorrow the same laws that she follows today is...a truth which no man can know; but...we must postulate or assume it.
The art of being wise is the art of knowing what to overlook.
The difference between a good man and a bad one is the choice of the cause.
The most any one can do is to confess as candidly as he can the grounds for the faith that is in him, and leave his example to work on others as it may.
There is no worse lie than a truth misunderstood by those who hear it.
