The only justification for our concepts and systems of concepts is that they serve to represent the complex of our experiences; beyond this they have not legitimacy.
Albert EinsteinDon't second guess the mistakes you've made, others will do that for you. Make things as simple as possible, but not simpler.
Albert EinsteinA knowledge of the existence of something we cannot penetrate, of the manifestations of the profoundest reason and the most radiant beauty - it is this knowledge and this emotion that constitute the truly religious attitude; in this sense, and in this alone, I am a deeply religious man.
Albert Einstein