“Faith doesn’t mean that you never doubt. It only means that you never act upon your doubts.”

“I will not attack your doctrines nor your creeds if they accord liberty to me. If they hold thought to be dangerous – if they aver that doubt is a crime, then I attack them one and all, because they enslave the minds of men.I attack the monsters, the phantoms of imagination that have ruled the world. I attack slavery. I ask for room — room for the human mind.”

“The only walls that exist are those you have placed in your mind. And whatever obstacles you conceive, exist only because you have forgotten what you have already achieved.”

“Doubts are the ants in the pants of faith. They keep it awake and moving.”

“The deep roots never doubt spring will come.”

“Life is doubt,And faith without doubt is nothing but death.”

“Sometimes I think it is my mission to bring faith to the faithless, and doubt to the faithful.”

“Doubt isn’t the opposite of faith; it is an element of faith.”

“To ‘choose’ dogma and faith over doubt and experience is to throw out the ripening vintage and to reach greedily for the Kool-Aid.”

“You are never dedicated to something you have complete confidence in. No one is fanatically shouting that the sun is going to rise tomorrow. They know it’s going to rise tomorrow. When people are fanatically dedicated to political or religious faiths or any other kinds of dogmas or goals, it’s always because these dogmas or goals are in doubt.”

“In these times I don’t, in a manner of speaking, know what I want; perhaps I don’t want what I know and want what I don’t know.”

“Doubt everything. Find your own light.”

“Even a wise man knows doubt from time to time, it is the fool who allows it to rule his judgement.”

“Yes, Kālāmas, it is proper that your have doubt, that you have perplexity, for a doubt has arisen in a matter which is doubtful. Now, look you Kālāmas, do not be led by reports, or traditions, or hearsay. Be not led by the authority of religious texts, not by the delight in speculative opinions, nor by seeming possibilities, not by the idea: ‘this is our teacher’. But, O Kālāmas, when you know for yourself that certain things are unwholesome, and wrong, and bad, then give them up… And when you know for yourself that certain things are wholesome and good, then accept them and follow them.”