In the days of thy youth seek to obtain that which shall compensate the losses of thy old age.

I have offended God and mankind because my work didn't reach the quality it should have.

I roamed the countryside searching for answers to things I did not understand. Why shells existed on the tops of mountains. How the various circles of water form around the spot which has been struck by a stone, and why a bird sustains itself in the air.

Many have made a trade of delusions and false miracles, deceiving the stupid multitudes.

Oh! Speculators on things, boast not of knowing the things that nature ordinarily brings about; but rejoice if you know the end of those things which you yourself device.

One can have no more mastery over the environment, than one has over himself.

The eye encompasses the beauty of the whole world.