We must all obey the great law of change. It is the most powerful law of nature.
To cherish what remains of the Earth and to foster its renewal is our only legitimate hope of survival.
Until you value yourself, you won't value your time. Until you value your time, you will not do anything with it.
We must be willing to fail and to appreciate the truth that often 'Life is not a problem to be solved, but a mystery to be lived.'
When all life is seen as divine, everyone grows wings.
Take care of your body. It's the only place you have to live.
Early in life I had to choose between honest arrogance and hypocritical humility. I chose the former and have seen no reason to change.
Blessed be Providence which has given to each his toy: the doll to the child, the child to the woman, the woman to the man, the man to the devil!
During the first period of a man's life the greatest danger is not to take the risk.
The difficulty we have in accepting responsibility for our behaviour lies in the desire to avoid the pain of the consequences of that behaviour
Let the guarantee of free speech be in every man's determination to use it, and we shall have no need of paper declarations.
We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology.
Be thankful that you have a life, and forsake your vain and presumptuous desire for a second one.
Short as life is, we make it still shorter by the careless waste of time.
Everything existing in the universe is the fruit of chance and necessity.
The more man meditates upon good thoughts, the better will be his world and the world at large.
To live is the rarest thing in the world. Most people exist, that is all.
Too much of a good thing can be wonderful!
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.
To one extent, if you've seen one city slum, you've seen them all.
Being a hero is about the shortest-lived profession on earth.