1. Exposition

Who is this Spirit?

Ephesians 4:4 (ESV)

4 There is one body and one Spirit just as you were called to the one hope that belongs to your call

He is the Spirit of wisdom and revelation (Ephesians 1:17; Ephesians 3:5), with whom we are sealed for the day of redemption (Ephesians 1:13; Ephesians 3:5).