G2901–κραταιόω–krataioō

-- And the child grew and was strengthened in spirit; and he was in the deserts until the day of his shewing to Israel.

ἐκραταιοῦτο ekrataiouto “he was strengthened”

And the child grew and waxed strong [supplied: in spirit], filled with wisdom, and God's grace was upon him.

ἐκραταιοῦτο ekrataiouto “He was being strengthened”

Be vigilant; stand fast in the faith; quit yourselves like men; be strong.

κραταιοῦσθε. krataiousthe “do be strong.”

in order that he may give you according to the riches of his glory, to be strengthened with power by his Spirit in the inner man;

κραταιωθῆναι krataiōthēnai “to be strengthened”