"The greatest pleasure of a gardener is to survey his work, and to admire the result of his own industry."

"The classes are for the genera, the genera for the species, the species for the individuals."

"The whole system of nature is nothing but a system of sexual generation."

"The natural system will always remain the greatest goal for botanists."

"Blessed be the Lord for the beauty of summer and spring, for the air, the water, the verdure, and the song of birds."