The effectiveness of work increases according to geometric progression if there are no interruptions.

Men fear silence as they fear solitude, because both give them a glimpse of the terror of life's nothingness.

Housekeeping in common is for women the acid test.

The minds of different generations are as impenetrable one by the other as are the monads of Leibniz.

If you create an act, you create a habit. If you create a habit, you create a character. If you create a character, you create a destiny.

Modesty and unselfishness - these are the virtues which men praise - and pass by.

The difficult part in an argument is not to defend one's opinion but rather to know it.