The truth of a theory can never be proven, for one never knows if future experience will contradict its conclusions.
The most beautiful thing we can experience is the mysterious. It is the source of all true art and science.
The only source of knowledge is experience.
I never teach my pupils, I only attempt to provide the conditions in which they can learn.
Mathematics deals exclusively with the relations of concepts to each other without consideration of their relation to experience.
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.
Experience alone can decide on truth.
The physicist's greatest tool is his wastebasket.
It was the experience of mystery - even if mixed with fear - that engendered religion.
Conceptions without experience are void; experience without conceptions is blind.
All our thoughts and concepts are called up by sense-experiences and have a meaning only in reference to these sense-experiences. On the other hand, however, they are products of the spontaneous activity of our minds; they are thus in no wise logical consequences of the contents of these sense-experiences. If, therefore, we wish to grasp the essence of a complex of abstract notions we must for the one part investigate the mutual relationships between the concepts and the assertions made about them; for the other, we must investigate how they are related to the experiences.
The theoretical idea ... does not arise apart from and independent of experience; nor can it be derived from experience by a purely logical procedure. It is produced by a creative act. Once a theoretical idea has been acquired, one does well to hold fast to it until it leads to an untenable conclusion.
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.
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