Beyond doubt, the worshipper of God shows ignorance when he criticizes others on account of their beliefs. If he understood the saying of Junayd, “The color of the water is the color of the vessel containing it,” he would not interfere with the beliefs of others, but would perceive God in every form and in every belief.

Not only are moral laws with their principles essentially distinguished from every other kind of practical knowledge in which there is anything empirical, but all moral philosophy rests wholly on its pure part. When applied to man, it does not borrow the least thing from the knowledge of man himself (anthropology), but gives laws a priori to him as a rational being. No doubt these laws require a judgment sharpened by experience, in order on the one hand to distinguish in what cases they are applicable, and on the other to procure for them access to the will of the man and effectual influence on conduct; since man is acted on by so many inclinations that, though capable of the idea of a practical pure reason, he is not so easily able to make it effective in concreto in his life.

Doubt is part of all religions. All the religious thinkers were doubters.

Philosophy goes no further than probabilities, and in every assertion keeps doubt in reserve.

In the minds of most men, the kingdom of opinion is divided into three territories - the territory of yes, the territory of no, and a broad, unexplored middle ground of doubt.

He who has conquered doubt and fear has conquered failure.

Religion is full of difficulties, but if we are often puzzled what to think, we need seldom be in doubt what to do.

There can be no doubt but that everything in the world, by the beauty of its order, and the evidence of a determinate and beneficial purpose which pervades its, testifies that some supreme efficient Power must have pre-existed, by which the whole was ordained for a specific end.

I believe that the first test of a truly great man is his humility. I do not mean by humility, doubt of his own powers. But really great men have a curious feeling that the greatness is not in them, but through them. And they see something divine in every other man.

This is the true nature of home it is the place of Peace; the shelter, not only from injury, but from all terror, doubt and division.

Creativity requires the freedom to consider "unthinkable" alternatives, to doubt the worth of cherished practices. Every organization, every society is under the spell of assumptions so familiar that they are never questioned, least of all by those most intimately involved.

Human beings are perhaps never more frightening than when they are convinced beyond doubt that they are right.

To doubt everything and to believe everything are two equally convenient solutions; both free us from the necessity of reflection.

Human beings are perhaps never more frightening than when they are convinced beyond doubt that they are right.

The greatest power God gave us is the power to choose. We have the opportunity to choose whether we’re going to act or procrastinate, believe or doubt, pray or curse, help or heal. We also choose whether we’re going to be happy or whether we’re going to be sad.

Look solely for happiness, and I doubt you'll find it. Forget about happiness, seek wisdom and goodness, and happiness will probably find you.

Without doubt, the highest privilege of wealth is the opportunity it affords for doing good, without giving up one’s fortune.

Never doubt that a small group of thoughtful, committed people can change the world. Indeed, it is the only thing that ever has.

Faith which does not doubt is a dead faith.

Life is doubt, and faith without doubt is nothing but death.