What time can be more beautiful when the one in which the finest virtues, innocent cheerfulness and indefinable longing for love constitute the sole motives of your life.

One of the first conditions of happiness is that the link between Man and Nature shall not be broken.

The difference between real material poison and intellectual poison is that most material poison is disgusting to the taste, but intellectual poison, which takes the form of cheap newspapers or bad books, can unfortunately sometimes be attractive.

Between the murder of an animal and the murder of a man, there's no more than ONE step!

In order to know what he is, a man must first know what the sum of this mysterious humanity is, a humanity made up of people who, like himself, do not understand what they are.

The sole meaning of life is to serve humanity.

In order to understand, observe, deduce, man must first be conscious of himself as alive.