If I could do it all again, I'd be a plumber.

The truth of a theory can never be proven, for one never knows if future experience will contradict its conclusions.

If one day you have to choose between the world and love, remember this: If you choose the world you’ll be left without love, but if you choose love, with it you will conquer the world

From the standpoint of daily life, however, there is one thing we do know: that we are here for the sake of each other - above all for those upon whose smile and well-being our own happiness depends, and also for the countless unknown souls with whose fate we are connected by a bond of sympathy. Many times a day I realize how much my own outer and inner life is built upon the labors of my fellow men, both living and dead, and how earnestly I must exert myself in order to give in return as much as I have received.

Life is a Mystery, not a problem waiting to be solved.

The words of language, as they are written or spoken, do not seem to play any role in my mechanism of thought. The physical entities which seem to serve as elements in thought are certain signs and more or less clear images.

On the other hand, the concept owes its meaning and its justification exclusively to the totality of the sense impressions which we associate with it.