Cap. VI Arg. 7: Prosper and Hilary — Pelagian remnants reject a fixed elect number
The Pelagian remnants said it more openly still — Prosper and Hilary in their letters to Augustine. Prosper: they will not grant predestination that the elect's number can neither grow nor shrink. Hilary: they will not have a defined number of those to be chosen and rejected.
Latin
Multo autem apertius id asseruerunt Pelagianorum reliqui, apud Prosperum et Hilarium in Epistolis ad Augustinum. Sic igitur Prosper: Non acquiescunt praedestinationi, electorum numerum nec augeri posse nec minui. Et Hilarius: Hi non recipiunt, ut eligendorum et rejiciendorum esse definitum numerum velint.