"I consider it the greatest achievement to be a good observer."

"The stony rocks are not primeval, but daughters of Time."

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

"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…"

"If a tree dies, plant another in its place."