και 2532 CONJ πληροφορηθεις 4135 5685 V-APP-NSM οτι 3754 CONJ ο 3739 R-ASN επηγγελται 1861 5766 V-RNI-3S δυνατος 1415 A-NSM εστιν 2076 5748 V-PXI-3S και 2532 CONJ ποιησαι 4160 5658 V-AAN
Vincent's NT Word Studies
21. Being fully persuaded (plhroforhqeiv). Rev., more accurately, fully assured. See on most surely believed, Luke i. 1. The primary idea is, being filled with a thought or conviction.Able (dunatov). The sense is stronger: mighty; compare Luke i. 49; xxiv. 19; Acts xviii. 24; 2 Cor. x. 4; Apoc. vi. 15.
Robertson's NT Word Studies
4:21 {Being fully assured} (pleroforeqeis). First aorist passive participle of pleroforew, from plrophoros and this from pleres and ferw, to bear or bring full (full measure), to settle fully. Late word, first in LXX but frequent in papyri in sense of finishing off or paying off. See on Lu 1:1; Ro 14:5. {What he had promised} (ho epggeltai). Perfect middle indicative of epaggellomai, to promise, retained in indirect discourse according to usual Greek idiom. {He was able} (dunatos estin). Present active indicative retained in indirect discourse. The verbal adjective dunatos with estin is here used in sense of the verb dunatai (#Lu 14:31; Ac 11:17).