The bitter and the sweet come from the outside, the hard from within, from one's own efforts.
I think and think for months and years. Ninety-nine times, the conclusion is false. The hundredth time I am right.
Any fool can make things bigger, more complex, and more violent. It takes a touch of genius-and a lot of courage-to move in the opposite direction.
The man who regards his own life and that of his fellow creatures as meaningless is not merely unfortunate but almost disqualified for life.
The most powerful force in the universe is compound interest
Our death is not an end if we can live on in our children and the younger generation. For they are us, our bodies are only wilted leaves on the tree of life.
The devil has put a penalty on all things we enjoy in life. Either we suffer in health or we suffer in soul or we get fat.
Only one who devotes himself to a cause with his whole strength and soul can be a true master. For this reason mastery demands all of a person.
I regard class differences as contrary to justice and, in the last resort, based on force.
If my theory of relativity is proven successful, Germany will claim me as a German and France will declare that I am a citizen of the world. Should my theory prove untrue, France will say that I am a German and Germany will declare that I am a Jew.
The most beautiful experience we can have is the mysterious - the fundamental emotion which stands at the cradle of true art and true science.
Look deep into nature, and then you will understand everything better.
Weakness of attitude becomes weakness of character.
Everything that is really great and inspiring is created by the individual who can labor in freedom.
Technological change is like an axe in the hands of a pathological criminal.