Life must be lived forward, but can only be understood backward.
Delay is preferable to error.
Go left. Go right. Don't do it, do it. Yeh those are choices that anyone can see. But only smart people recognize that not doing anything is a choice all on its own. You just chose not to make a choice.
Wherever you go, go with all your heart.
I think, therefore I am.
I never think of the future. It comes soon enough.
It is not the strongest of the species that survive, nor the most intelligent, but the one most responsive to change.
All of science is nothing more than the refinement of everyday thinking.
Who is more humble? The scientist who looks at the universe with an open mind and accepts whatever the universe has to teach us, or somebody who says everything in this book must be considered the literal truth and never mind the fallibility of all the human beings involved?
The important thing is not to stop questioning. Curiosity has its own reason for existing. One cannot help but be in awe when he contemplates the mysteries of eternity, of life, of the marvelous structure of reality.