A scientist is a mimosa when he himself has made a mistake, and a roaring lion when he discovers a mistake of others.

If I give you a pfennig, you will be one pfennig richer and I'll be one pfennig poorer. But if I give you an idea, you will have a new idea, but I shall still have it too.

In a sailboat I become oblivious to everything else in the world.

Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

[Ernest Rutherford is]...a second Newton.

One always likes to do the things for which one has ability.

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.