Source identified1
“Forgiveness to the injured does belong; But they ne’er pardon, who have done the wrong.”
Zulema cynically suggests that pardon belongs to the person who was harmed while the wrongdoer may remain trapped in shame or hostility; the drama immediately undercuts him by showing that he plans fresh deception.
Source note: The Conquest of Granada, Part II, The Works of John Dryden, Volume IV, Project Gutenberg #15349. Zulema speaks after being pardoned and immediately proposes “feigned honesty” to regain trust, making this a compromised character perspective rather than Dryden’s direct moral instruction.