To the end he may stablish (εις το στηριξα). Another example of εις and the articular infinitive of purpose. Same idiom in 1. Thessalonians 3:2. From στηριζω, from στηριγξ, a support.

Unblameable (αμεμπτους). Old compound adjective (α privative and verbal of μεμφομα, to blame). Rare in N.T. Predicate position here. Second coming of Christ again.