The moral virtues, then, are produced in us neither by nature nor against nature. Nature, indeed, prepares in us the ground for their reception, but their complete formation is the product of habit.
Source: In The Ethics of Aristotle, bk. 1, ch. 9, 1953.
-- Aristotle, ( 384BC-322BC), Greek writer, philosopher; He is credited with inventing logic and the science of reasoning.