"My mind reels when, on this height, I look down on the long ages that have flowed by like waves in the sound and have left traces of the ancient world, traces so nearly obscured that they can only whi…"

"The calyx is the marriage bed, the corolla the bed-curtains, the filaments the spermatic vessels, the anthers the testes, the pollen the semen, the pistil the vagina, the ovary the uterus, the ovules …"

"The knowledge of plants is a science, but the love of plants is an art."

"My life has been dedicated to the service of nature."

"When the spiritual light is concentrated in the brain, everything else must be sinking in the dark."