There are few enough people with sufficient independence to see the weaknesses and follies of their contemporaries and remain themselves untouched by them.

To act intelligently in human affairs is only possible if an attempt is made to understand the thoughts, motives, and apprehension of one's opponent so fully that one can see the world through their eyes.

As to science, we may well define it for our purpose as "methodical thinking directed toward finding regulative connections between our sensual experiences".

But if the longing for the achievement of the goal is powerfully alive within us, then shall we not lack the strength to find the means for reaching the goal and for translating it into deeds.

I make it a rule not to clutter my mind with simple information that I can find in a book in five minutes.

Dear Posterity, If you have not become more just, more peaceful, and in general more sensible... then may the Devil take you!

I have made no secret, either privately or publicly, of any sense of outrage over officially enforced military and war service. I regard it as a duty of conscience to fight against such barbarous enslavement of the individual with every means available.