“It is beyond a doubt that all our knowledge begins with experience.”

But only he who, himself enlightened, is not afraid of shadows.

Rules for happiness: something to do, someone to love, something to hope for.

Things which as effects presuppose others as causes cannot be reciprocally at the same time causes of these.

Freedom, is a property of all rational beings.

Nature is beautiful because it looks like Art; and Art can only be called beautiful if we are conscious of it as Art while yet it looks like Nature.

The enjoyment of power inevitably corrupts the judgement of reason, and perverts its liberty.

Morality is not properly the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness.

Woman wants control, man self-control.

Two things fill the mind with ever-increasing wonder and awe, the more often and the more intensely the mind of thought is drawn to them: the starry heavens above me and the moral law within me.

The great mass of people are worthy of our respect.

Laughter is an affect resulting from the sudden transformation of a heightened expectation into nothing.

The greatest human quest is to know what one must do in order to become a human being.

Prudence reproaches; conscience accuses.

From such crooked wood as that which man is made of, nothing straight can be fashioned.

Dare to know! Have the courage to use your own intelligence!

Space and time are the framework within which the mind is constrained to construct its experience of reality.

I never doubted that equal rights was the right direction. Most reforms, most problems are complicated. But to me there is nothing complicated about ordinary equality.

She quietly expected great things to happen to her, and no doubt that’s one of the reasons why they did.

At every sunrise I renounce the doubts of night and greet the new day of a most precious delusion.

No doubt the artist is the child of his time; but woe to him if he is also its disciple, or even its favorite.

When you doubt your power, you give power to your doubt.

Almost the moment he died, they put him in Playboy as one of the greatest drummers, which he was – there’s no doubt about it. There’s never been anybody since. He’s one of the greatest drummers that ever lived.

So don’t be afraid – you were meant to rise above your ceiling of doubt.

I don’t have any doubt in my mind: I could knock out any man in the heavyweight division.