Those who desire to rise as high as our human condition allows, must renounce intellectual pride, the omnipotence of clear thinking, belief in the absolute power of logic.

Comforts and syphilis are the greatest enemies of mankind.

The most efficient way to live reasonably is every morning to make a plan of one's day and every night to examine the results obtained.

One must train oneself, by small and frequent efforts, to dominate one's feelings.

Discipline brings us effort, sacrifice and suffering. Later it brings us something of an inestimable value: something of which those who live only for pleasure, profit or amusement will always be deprived. This peculiar indefinable joy which one must have felt oneself to understand is the sign with which life marks its moment of triumph.

In man, the things which are not measurable are more important than those which are measurable.

Like hatred, jealousy is forbidden by the laws of life because it is essentially destructive.