“The earth has what you raise off the earth. It has nothing more.”

“The more we learn about volcanoes, the more we learn about the earth. Learning about the earth is more important than it has ever been.”

“Earth has no sorrow that earth can not heal.”

“You will never cease to be the most amazed person on earth at what God has done for you on the inside.”

“Are physical forces alone at work there, or has evolution begotten something more complex, something not unakin to what we know on Earth as life?”

“There is nothing on this earth more to be prized than true friendship.”

“Proposition 14. The straight line joined from the centre of the earth to the centre of the moon has to the straight line cut off from the axis towards the centre of the moon by the straight line subtending the (circumference) within the earth's shadow a ratio greater than that which 675 has to 1.”

“You either approve of violence or you don't, and nothing on earth is more violent or extreme than the meat industry.”

“What has always made the state a hell on earth has been precisely that man has tried to make it heaven.

As translated by Michael Hamburger”

“A baby has brains, but it doesn't know much. Experience is the only thing that brings knowledge, and the longer you are on earth the more experience you are sure to get.”