"Nature's economy shall be the base for our own, for it is immutable, but ours is secondary. An economist without knowledge of nature is therefore like a physicist without knowledge of mathematics."

"I saw the infinite, all-knowing and all-powerful God from behind as he went away, and I grew dizzy. I followed his footsteps over nature's fields and saw everywhere an eternal wisdom and power, an ins…"

"Man is the measure of all things, but the Creator is the measure of man."

"The African is lazy, crafty, negligent, and governed by caprice."

"The world is a book, and those who do not travel read only one page."