Concern for man himself and his fate must always form the chief interest of all technical endeavors, concern for the great unsolved problems of the organization of labor and the distribution of goods-in order that the creations of our mind shall be a blessing and not a curse to mankind. Never forget this in the midst of your diagrams and equations.

Science can only ascertain what is, but not what should be, and outside of its domain value judgments of all kinds remain necessary.

The grand aim of all science is to cover the greatest number of empirical facts by logical deduction from the smallest number of hypotheses.

The scientist finds his reward in what Henri Poincare calls the joy of comprehension, and not in the possibilities of application to which any discovery may lead.