NOTE: This is properly an Ablative of Means (instrumental) and the verbs are really in the middle voice (§156. a). Thus útor with the ablative siguifies I employ myself (or avail myself) by means of, etc. But these earlier meanings disappeared from the language, leaving the construction as we find it.
a. Potior sometimes takes the Genitive, as always in the phrase potíri rérum, to get control or be master of affairs (§35*. a):
NOTE 1: In early Latin, these verbs are sometimes transitive and take the accusative: IfinctuS est efficium (Tar. Ph. 281), he performed the pert, eta. ille patria potitur commoda (Tar. Ad. 871), he enjoys his ancestral estate.
NOTE 2: The Gerundive of these verbs is used personally in the passive as if the verb were transitive (but at. §500.3): as,-Hiracbo- omnia jitenda ae possidenda tr* diderat (verr. ii. 46), he had given over everything to Leraclius for his use and possession (to be used and possessed).