Gregor Mendel — "I have sown many seeds, but only a few have borne fruit."

"You should regard the numerical expressions as being only empirical, because they can not be proved rational."

"If I were to live a hundred years, I would not have enough time to test all the possible combinations."

"The inheritance of traits is not a matter of chance but of law."

"That no generally applicable law of the formulation and development of hybrids has yet been successfully formulated can hardly astonish anyone who is acquainted with the extent of the task and who can…"

"The characters which are transmitted from the parents to the offspring are constant and definite."