The Greek conjunction eiper is an emphatic conditional — 'if indeed' or 'since indeed.' It presupposes the reality of the condition with some confidence, often introducing a logical inference. Unlike simple ei (if), eiper leans toward the assumption that the condition is true.
Paul uses eiper at critical theological moments to draw inferences from assumed realities: 'if indeed you heard him and were taught in him' (Ephesians 4:21), 'if indeed the Spirit of God dwells in you' (Romans 8:9). These are not doubts but logical anchors — because these things are true, therefore this follows. Eiper grounds ethical imperatives in doctrinal realities, making Christian living the logical outworking of what is true in Christ.