Darkness cannot drive out darkness； only light can do that.Hate cannot drive out hate； only love can do that.

"The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter."

A man's life is limited, but service to the people is infinite.

The measure of a good book is whether or not it makes you see the world differently.

Leadership in the coal industry today means navigating the delicate balance between economic necessity and environmental responsibility.