If one asks the whence derives the authority of fundamental ends, since they cannot be stated and justified merely by reason, one can only answer: they exist in a healthy society as powerful traditions, which act upon the conduct and aspirations and judgments of the individuals; they are there, that is, as something living, without its being necessary to find justification for their existence.
Albert EinsteinAs far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality.
Albert EinsteinA conviction akin to religious feeling of the rationality or intelligibility of the world lies behind all scientific work of a high order.
Albert EinsteinI am not a positivist. Positivism states that what cannot be observed does not exist. This conception is scientifically indefensible, for it is impossible to make valid affirmations of what people 'can' or 'cannot' observe. One would have to say 'only what we observe exists,' which is obviously false.
Albert Einstein