It seems that perfection is attained not when there is nothing more to add, but when there is nothing more to take away.
It is only with the heart that one can see rightly; what is essential is invisible to the eye.
You become responsible, forever, for what you have tamed.
A man who dares to waste one hour of time has not discovered the value of life.
Understand however that every man is worth just so much as the things are worth about which he busies himself.
Nothing in the world is worth having or worth doing unless it means effort, pain, difficulty.