“You frequently state, and in your letter you imply, that I have developed a completely one-sided outlook and look at everything in terms of science. Obviously my method of thought and reasoning is influenced by a scientific training – if that were not so my scientific training will have been a waste and a failure. But you look at science (or at least talk of it) as some sort of demoralizing invention of man, something apart from real life, and which must be cautiously guarded and kept separate from everyday existence. But science and everyday life cannot and should not be separated. Science, for me, gives a partial explanation of life. In so far as it goes, it is based on fact, experience and experiment. Your theories are those which you and many other people find easiest and pleasantest to believe, but so far as I can see, they have no foundation other than they leaf to a pleasanter view of life (and an exaggerated idea of our own importance)...I agree that faith is essential to success in life (success of any sort) but I do not accept your definition of faith, i.e. belief in life after death. In my view, all that is necessary for faith is the belief that by doing our best we shall come nearer to success and that success in our aims (the improvement of the lot of mankind, present and future) is worth attaining. Anyone able to believe in all that religion implies obviously must have such faith, but I maintain that faith in this world is perfectly possible without faith in another world…It has just occurred to me that you may raise the question of the creator. A creator of what? ... I see no reason to believe that a creator of protoplasm or primeval matter, if such there be, has any reason to be interested in our significant race in a tiny corner of the universe, and still less in us, as still more significant individuals. Again, I see no reason why the belief that we are insignificant or fortuitous should lessen our faith – as I have defined it.”

“Some nonreligious people are disgruntled by the word "faith," feeling that it has no connection to them. But we all have faith. Broadly speaking, "faith" does not apply only to belief in the supernatural. We have faith in our life, for example, believing we will live to see tomorrow, or in our health, believing we have years of healthy life ahead of us. Husbands and wives, parents and children have faith in one another.”

“Faith belongs to the human spirit. Faith is faith. Humanity is divided by religion, religion is the divider of humanity. If every human could be removed of their blindfolds and see that faith is in itself faith and that this is something which belongs to each and every human being, then at that time the dividers of religion will suddenly mean nothing and we will all see that we are united by faith in and of itself. There is only one faith and it is called faith. And no man needs to prove to another man that what he believes in exists, because even if it does not exist, his faith is his belief that it is there, that something is there, and that in itself is faith. So I do not need to prove to any man that what I believe in exists or not, there is no such contest between man, my faith breathes in the body of my belief; the fact that I believe is the breath of my faith.”

“Our belief is not a belief. Our principles are not a faith. We do not rely soley upon science and reason, because these are necessary rather than sufficient factors, but we distrust anything that contradicts science or outrages reason. We may differ on many things, but what we respect is free inquiry, openmindedness, and the pursuit of ideas for their own sake.”

“I discovered later, and I'm still discovering right up to this moment, that is it only by living completely in this world that one learns to have faith. By this-worldliness I mean living unreservedly in life's duties, problems, successes and failures. In so doing we throw ourselves completely into the arms of God, taking seriously, not our own sufferings, but those of God in the world. That, I think, is faith.”

“We believe that it is possible for scientific work to gain some knowledge about the reality of the world, by means of which we can increase out power and in accordance with which we can arrange our life. If this belief is an illusion, then we are in the same position as you. But science has given us evidence by its numerous and important successes that it is no illusion.”