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

What this power is I cannot say; all I know is that it exists and it becomes available only when a man is in that state of mind in which he knows exactly what he wants and is fully determined not to quit until he finds it.

Observe, Remember, Compare.

You cannot force ideas. Successful ideas are the result of slow growth. Ideas do not reach perfection in a day, no matter how much study is put upon them.

I have heard articulate speech produced by sunlight I have heard a ray of the sun laugh and cough and sing! … I have been able to hear a shadow, and I have even perceived by ear the passage of a cloud across the sun's disk.

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.