Whether you can observe a thing or not depends on the theory which you use. It is the theory which decides what can be observed.
Try and penetrate with our limited means the secrets of nature and you will find that, behind all the discernible concatenations, there remains something subtle, intangible and inexplicable. Veneration for this force beyond anything that we can comprehend is my religion. To that extent I am, in point of fact, religious.
I believe in Spinoza's God, Who reveals Himself in the lawful harmony of the world, not in a God Who concerns Himself with the fate and the doings of mankind.
Life is like riding a bicycle. To keep your balance you must keep moving.
I believe that whatever we do or live for has its causality; it is good, however, that we cannot see through to it.
I never think of the future. It comes soon enough.
It can scarcely be denied that the supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a single datum of experience.
All of science is nothing more than the refinement of everyday thinking.
One may say "the eternal mystery of the world is its comprehensibility."
All religions, arts and sciences are branches of the same tree. All these aspirations are directed toward ennobling man's life, lifting it from the sphere of mere physical existence and leading the individual towards freedom.
Physical concepts are free creations of the human mind, and are not, however it may seem, uniquely determined by the external world.
最后这句是对我影响最大的，至今对我具有宗教功效，这句话也可以作为电影《生命之树》的题词： No matter how deeply one immerses oneself in work, a haunting feeling of inescapable tragedy persists. 【Still, there are moments when one feels free from one's own identification with human limitations and inadequacies. At such moments, one imagines that one stands on some spot of a small planet, gazing in amazement at the cold yet profoundly moving beauty of the eternal, the unfathomable: life and death flow into one, and there is neither evolution nor destiny; only being.】