"The development of every living thing is based on a preordained plan."

"The value and utility of any experiment are determined by the fitness of the material to the purpose for which it is used, and thus in the case before us it cannot be immaterial what plants are subjec…"

"The laws of heredity are universal, whether in peas or in men."

"I hope that my experiments will furnish a new basis for the study of the history of the organic forms."

"I have experienced many a bitter hour in my life. Nevertheless, I admit gratefully that the beautiful, good hours far outnumbered the others."