for it has the potency on the terms on which this is a potency of acting, and it is this not in all circumstances but on certain conditions, among which will be the exclusion of external hindrances;
baina potentzia ez da beti ematen, zenbait baldintzatan baizik, eta baldintzetan kanpoko eragozpenak ere baztertuak izango dira, 20) definizioan ematen diren zenbait baldintzak baztertzen baitituzte).