If I were to start taking care of my grooming, I would no longer be my own self.

My only refuge, as a serious young man, from the despair of my financial burden to my family, is that I did everything I could to never permit myself any amusements or diversions except those afforded by my studies.

He who can no longer pause to wonder and stand rapt in awe, is as good as dead; his eyes are closed.

The payment of the worker is not determined by the value of his product.

Even though the realms of religion and science in themselves are clearly marked off from each other, nevertheless there exist between the two strong reciprocal relationships and dependencies.

A model should be as simple as it can be but no simpler

Scientists investigate that which already is; Engineers create that which has never been.