Sadi, The Persian Literature, Comprising The Shah Nameh…
“ XVI Show no mercy to a subdued foe, for if he recover himself he will show you no mercy:—When thou seest thy antagonist in a reduced state, curl not thy whiskers at him in contempt, for in every bone there is marrow, and within every jacket there is a man.XVII Whoever puts a wicked man to death delivers mankind from his mischief, and the wretch himself from God's vengeance:—Beneficence is praiseworthy; yet thou shouldst not administer a balsam to the wound of the wicked. Knew he not who took compassion on a snake, that it is the pest of the sons of Adam. ”
