Pain don't hurt.

The reality of the building does not consist in the roof and walls, but in the space within to be lived in.

Do not wait for the last judgment. It comes every day.

Life shrinks or expands in proportion to one's courage.

It is only because of problems that we grow mentally and spiritually.

The desire to fly is an idea handed down to us by our ancestors who... looked enviously on the birds soaring freely through space... on the infinite highway of the air

Life is made up of marble and mud.

Every person who ever thought he had a right to assert, and went boldly and asserted it, himself, or jointly with others that shared his convictions, was a direct actionist.

Close by the Rights of Man, at the least set beside them, are the Rights of the Spirit.

I want to feel my life while I'm in it.

Early in life I had to choose between honest arrogance and hypocritical humility. I chose the former and have seen no reason to change.

Life is not an exact science, it is an art.

Yesterday is dead, tomorrow hasn't arrived yet. I have just one day, and I'm going to be happy in it.

All that is not eternal is eternally out of date.

Within the child lies the fate of the future.

Is it progress if a cannibal uses a fork?

The worldly comforts are not for me. I am like a traveller, who takes rest under a tree in the shade and then goes on his way.

All my life through, the new sights of nature made me rejoice like a child.

Science is the most reliable guide for civilization, for life, for success in the world. Searching a guide other than the science is meaning carelessness, ignorance and heresy.

Should you find yourself in a chronically leaking boat, energy devoted to changing vessels is likely to be more productive than energy devoted to patching leaks.

Life is nothing but a competition to be the criminal rather than the victim.