"Homo Sapiens. Diurnus; varians cultura, loco. Europaeus albus, Asiaticus luridus, Africanus niger, Americanus rufus."

"When all the thoughts are concerning one thing and the person loses interest in other things, the melancholy begins."

"The whole earth is a garden, and man is its gardener."

"God created, Linnaeus arranged. It is astonishing how many new species are discovered every day."

"Whoever wishes to be a good botanist must be a good observer."