Loving enemies is another dogma of feigned morality, and has besides no meaning. It is incumbent on man, as a moralist, that he does not revenge an injury; and it is equally as good in a political sense, for there is no end to retaliation, each retaliates on the other, and calls it justice; but to love in proportion to the injury, if it could be done, would be to offer a premium for crime.
The Age of Reason (1795)