A belief is a lever that, once pulled, moves almost everything in a person’s life. Are you a scientist? A liberal? A racist? These are merely species of belief in action. Your beliefs define your vision of the world; they dictate your behavior; they determine your emotional responses to other human beings. If you doubt this, consider how your experience would suddenly change if you came to believe one of the following propositions:

1. You have only two weeks to live.
2. You've just won the lottery prize of one hundred million dollars.
3. Aliens have implanted a receiver in your skull and are manipulating your thoughts.

These are mere words- until you believe them. once believed, they become part of the very apparatus of your mind, determining your desires, fears, expectations, and subsequent behavior.

In adaptive terms, belief has been extraordinarily useful. It is, after all, by believing various propositions about the world that we predict events and consider the likely consequences of our actions. Beliefs are principles of action: whatever they may be at the level of the brain, they are processes by which our understanding (and misunderstanding) of the world is represented and made available to guide our behavior.

Belief is not a merely intellectual process, belief is not a mere persuasion of the mind, belief is something that is in our heart, and what you believe, you must do, because belief is from God. It is to the heart that God speaks, it is in the heart that God resides.... Here is a work that you have undertaken, a work so gigantic, so stupendous, the means for which are so poor, the resistance to which will be so strong, so organised ... and what means have you with which to carry out this tremendous work of yours? If you look at it intellectually, it is hopeless.... This intellectual process, if it is used honestly, if it is followed to the very end, leads you to despair. It leads you to death.

What are our beliefs designed for? They’re the guiding force to tell us what will lead to pain and what will lead to pleasure.

Beliefs are choices. First you choose your beliefs. Then your beliefs affect your choices.

A belief is what you know to be true because experience has made it evident to you. If you want to change your life, change your beliefs. If you want to change your beliefs, go out and have experiences that make them real to you. Not the opposite way around.

I have been vehemently accused by people who didn’t understand me of not believing in anything. I don’t believe in anything. This is not a statement of existential hopelessness for which you should light a candle for me at night. It’s a strategy for not getting bogged down in some weird trip. After all, what is the basis for believing anything? I mean, you have to understand: You’re a monkey. In some kind of a biological situation where everything has been evolved to serve the economy of survival — this is not a philosophy course. So belief is a curious reaction to the present at hand. It isn’t to be believed, it’s to be dealt with — experienced and modeled.

Beliefs create reality

Ninety percent of what we believe has nothing to do with the process of thought, but comes instead from the four sources of family inheritance, individual temperament, national culture, and economic self-interest; and while we cannot wholly cast off these shackles, we should at least recognize their cramping and distorting influence upon the free process of thought.

Belief, that sacred faculty which prompts the decisions of our will, and knits into harmonious working all the compacted energies of our being, is ours not for ourselves but for humanity. It is rightly used on truths which have been established by long experience and waiting toil, and which have stood in the fierce light of free and fearless questioning. Then it helps to bind men together, and to strengthen and direct their common action. It is desecrated when given to unproved and unquestioned statements, for the solace and private pleasure of the believer; to add a tinsel splendour to the plain straight road of our life and display a bright mirage beyond it; or even to drown the common sorrows of our kind by a self-deception which allows them not only to cast down, but also to degrade us. Whoso would deserve well of his fellows in this matter will guard the purity of his beliefs with a very fanaticism of jealous care, lest at any time it should rest on an unworthy object, and catch a stain which can never be wiped away. It is not only the leader of men, statesmen, philosopher, or poet, that owes this bounden duty to mankind. Every rustic who delivers in the village alehouse his slow, infrequent sentences, may help to kill or keep alive the fatal superstitions which clog his race. Every hard-worked wife of an artisan may transmit to her children beliefs which shall knit society together, or rend it in pieces. No simplicity of mind, no obscurity of station, can escape the universal duty of questioning all that we believe. It is true that this duty is a hard one, and the doubt which comes out of it is often a very bitter thing. It leaves us bare and powerless where we thought that we were safe and strong. To know all about anything is to know how to deal with it under all circumstances. We feel much happier and more secure when we think we know precisely what to do, no matter what happens, than when we have lost our way and do not know where to turn. And if we have supposed ourselves to know all about anything, and to be capable of doing what is fit in regard to it, we naturally do not like to find that we are really ignorant and powerless, that we have to begin again at the beginning, and try to learn what the thing is and how it is to be dealt with — if indeed anything can be learnt about it. It is the sense of power attached to a sense of knowledge that makes men desirous of believing, and afraid of doubting.

One believes things because one has been conditioned to believe them. Finding bad reasons for what one believes for other bad reasons- that's philosophy. People believe in God because they've been conditioned to believe in God.

All beliefs about matters of fact or real existence are derived merely from something that is present to the memory or senses, and a customary association of that with some other thing.

Every mental act is composed of doubt and belief,
but it is belief that is the positive, it is belief
that sustains thought and holds the world together.

Belief means not wanting to know what is true.