"Nature in every thing demands respect, and those who violate her laws seldom violate them with impunity." -Mary Wollstonecraft
Taken from Wollstonecraft's "A Vindication of the Rights of Women", 1792.
Here is the quote in context:
"To satisfy this genus of men, women are made systematically voluptuous, and though they may not all carry their libertinism to the same height, yet this heartless intercourse with the sex, which they allow themselves, depraves both sexes, because the taste of men is vitiated; and women, of all classes, naturally square their behaviour to gratify the taste by which they obtain pleasure and power. Women becoming, consequently, weaker, in mind and body, than they ought to be, were one of the grand ends of their being taken into the account, that of bearing and nursing children, have not sufficient strength to discharge the first duty of a mother; and sacrificing to lasciviousness the parental affection, that ennobles instinct, either destroy the embryo in the womb, or cast it off when born. Nature in every thing demands respect, and those who violate her laws seldom violate them with impunity. The weak enervated women who particularly catch the attention of libertines, are unfit to be mothers, though they may conceive; so that the rich sensualist, who has rioted among women, spreading depravity and misery, when he wishes to perpetuate his name, receives from his wife only an half-formed being that inherits both its father's and mother's weakness."