[σθενόω] from σθένος (bodily vigor; probably akin to the base of G2476); to strengthen, i.e. (figuratively) confirm (in spiritual knowledge and power)
Usages throughout the bible
1 Peter 5:10
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But the God of all grace, who hath called us unto his eternal glory by Christ Jesus, after that ye have suffered a while, make you perfect, stablish, strengthen, G4599 settle you.