“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.”

Few people can be happy unless they hate some other person, nation, or creed.

Sometimes the hardest thing in life is to know which bridge to cross and which to burn.

It seems to me fundamental dishonesty, and a fundamental treachery to intellectual integrity to hold a belief because you think it’s useful and not because you think it’s true.

The fundamental concept in social science is power, in the same sense in which energy is the fundamental concept in physics.

To be able to fill leisure intelligently is the last product of civilization, and at present, very few people have reached this level.

Dogmatism is the greatest of mental obstacles to human happiness.

There are two motives for reading a book; one, that you enjoy it; the other, that you can boast about it.

How much longer is the world willing to endure this spectacle of wanton cruelty?

The only thing that will redeem mankind is cooperation.

To fear love is to fear life, and those who fear life are already 3 parts dead.

It’s easy to fall in love. The hard part is finding someone to catch you.

I believe that when I die I shall rot, and nothing of my ego will survive.

Neither a man nor a crowd nor a nation can be trusted to act humanely or to think sanely under the influence of great fear.

Your writing is never as good as you hoped, but never as bad as you feared.

Not to be absolutely certain is, I think, one of the essential things in rationality.

One of the painful things about our time is that those who feel certainty are stupid, and those with any imagination and understanding are filled with doubt and indecision.

It is not about never doubting, it is about coming out on the other side with twice the faith you had going into your doubt.

If you want to be a real seeker of truth, you need to, at least once in your lifetime, doubt in, as much as it’s possible, in everything.

The collection of taxes which are not absolutely required, which do not beyond reasonable doubt contribute to public welfare, is only a species of legalized larceny. Under this Republic the rewards of industry belong to those who earn them.

Faith and doubt go hand in hand, they are complementaries. One who never doubts will never truly believe.

Doubters do not achieve; skeptics do not contribute; cynics do not create.

The past was great no doubt, but I sincerely believe that the future will be more glorious still.

If the Sun and Moon should ever doubt, they’d immediately go out.

And better had they ne’er been born, Who read to doubt, or read to scorn.