"I have been called a fool, but time will prove me right."

"If my work is ignored now, it will be recognized when the time is right."

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

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

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