The demands of the science, of the ethics and of the reason are superior to the demands of the people!

No writer has an imaginative power richer than what the streets offer.

A person who loves and kisses a tree is a normal person; a person who hates and cuts a tree is an abnormal person.

Conscience is a great moralist inside us with a stick in its hand. It is a whip of virtue which oppresses us unmercifully when we do wrong.

All truths can be changed! Put this brave idea to the centre of your beliefs! All truths can be changed!

Realise well, proud little man that even the highest clouds don't shine! For above all things there lie brightest stars.

When you long for the port, it is time to leave the journey; when you long for the journey, it is time to leave the port!