{Be strengthened} (endunamou). Present passive imperative
of endunamo(935c). See already  1Ti 1:12  Ro 4:20  Php 4:13  Eph
6:10 . "Keep on being empowered," "keep in touch with the power."
{In the grace that is in Christ Jesus} (en t(8869) chariti t(8869) en
Christ(9369) I(8873)ou). Where the power is located. Christ is the
dynamo for power only when and while we keep in touch with him.