While you are alone you are entirely your own master and if you have one companion you are but half your own, and the less so in proportion to the indiscretion of his behavior.

I have always felt it is my destiny to build a machine that would allow man to fly.

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

Constancy does not begin, but is that which perseveres.

I roamed the countryside searching for the answers to things I did not understand. Why shells existed on the tops of mountains along with the imprints of coral and plant and seaweed usually found in the sea. Why the thunder lasts a longer time than that which causes it and why immediately on its creation the lightening becomes visible to the eye while thunder requires time to travel. 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. These questions and other strange phenomena engaged my thought throughout my life.

I am not poor. Poor are those who desire many things.

I shall do down in history as the man who opened a door!