Of little worth is the recommendation which has for its prop the defamation of another.
Infirma commendatio est quae de alterius destructione fulcitur.
Original text (Latin)
Notes from Wikiquote
Adversus Marcionem, IV.15.5
Original text (Latin)
Quote text and notes from Wikiquote: Tertullian (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.