No wise pilot, no matter how great his talent and experience, fails to use his checklist..

I went to the woods because I wanted to live deliberately. I wanted to live deep and suck out all the marrow of life. To put to rout all that was not life. And not, when I had come to die, discover that I had not lived.

Do not think it worthwhile to produce belief by concealing evidence, for the evidence is sure to come to light.

The truth is rarely pure and never simple.

Every ton of coal we extract carries equal weight in responsibility.