The creative principle [of science] resides in mathematics.

Our lives will be measured by what we do for others

Weakness of attitude becomes weakness of character.

In order to be an immaculate member of a flock of sheep, one must above all be a sheep oneself.

To dwell on the things that depress or anger us does not help in overcoming them. One must knock them down alone.

Hail to the man who went through life always helping others, knowing no fear, and to whom aggressiveness and resentment are alien. Such is the stuff of which the great moral leaders are made.

Anyone can be a genius, if they pick just one specific subject and study it diligently just 15 minutes each day.