“cogency” in Latin

vis (force), vis ad facien dam fidem: pondus (weight): momentum (tenderncy to turn the scale in one’s favor, ῥοπή). To have great cogency, magno ad persuadendum momento esse (De Invent., 26, 77): firmum esse ad probandum: the conflicting reasons are of equal cogency, contrariarum rationum paria sunt momenta: the cogency of some arguments consists in their number, quaedam urgumenta turba valent (Quint.): there is little cogency in such arguments, hujusmodi argumenta nullius sunt momenti, or *parum firma sunt ad fidem faciendam or ad persuadendum: these arguments appear to you to be of some cogency, haec argumenta “aliquid apud vestros animos momenti habere videntur” (Cic.). The more and stronger reasons will have the most cogency, plures causae et majores ponder is plus habebunt. (Cic.): to produce an argument of great cogency, firmissimum aliquid afferre. This argument for the existence of the gods appears to me to have the greatest cogency, firmissimum hoc afferri videtur, cur deos esse credamus: it seems to me that there is not much cogency in the reason you allege, rationem eam, quae a te affertur, non satis firmam puto (Cic.): an argument of irresistible cagency, argumentum necessurium (Quint.): necessarie demonstrans (Cic.).