It must be conceded that a theory has an important advantage if its basic concepts and fundamental hypotheses are 'close to experience,' and greater confidence in such a theory is certainly justified. There is less danger of going completely astray, particularly since it takes so much less time and effort to disprove such theories by experience. Yet more and more, as the depth of our knowledge increases, we must give up this advantage in our quest for logical simplicity in the foundations of physical theory.
Albert EinsteinI am content in my later years. I have kept my good humor and take neither myself nor the next person seriously.
Albert EinsteinThe truth of a theory can never be proven, for one never knows if future experience will contradict its conclusions.
Albert EinsteinHow can any educated person stay away from the Greeks? I have always been far more interested in them than in science.
Albert Einstein