Sometimes we stare so long at a door that is closing that we see too late the one that is open.

A man, as a general rule, owes very little to what he is born with - a man is what he makes of himself.

The nation that secures control of the air will ultimately control the world.

When one door closes, another one opens.

We are all too much inclined, I think, to walk through life with our eyes shut. There are things all round us and right at our very feet that we have never seen, because we have never really looked.

Concentrate all your thoughts upon the work at hand. The sun's rays do not burn until brought to a focus.

Leave the beaten track behind occasionally and dive into the woods.