Ephesians 3:8 Unto me, who am less than least of all saints, is this grace given, that I should preach among Gentiles unsearchable riches of Christ.This wonderful verse taken from pinnacle of Epistles begins with a figure of speech, in which Paul belittles himself in order to draw attention to something very great and important. This is a common figure of speech called Litotes or Meiosis defined as a phrase that understates or lessens one thing in order to magnify another. Paul denigrates himself in order to magnify God’s grace.
Paul in Ephesians chapter two told how Jewish and Gentile remnant of believers from former dispensation had been made into one new man. He spoke of them all together as Gentiles (See 3:1; 4:1). It is to this new man that Paul proclaims his message.
The theme of Paul's message among Gentiles is unsearchable riches of Christ. When making a comparison of structure in this section, we see this expression is balanced by mystery of Christ in verse 4.
Now since mystery of Christ has been steadily unfolding from Genesis 1:1 up till dispensation of mystery completes it, we have also unfolding of His riches, their wealth and abundance.
In Genesis 1:1 He is Creator, and therefore owner of universe by right of creation. We meet with such expressions as "The earth is Lord's, and fullness thereof", "The world is Mine and fulness thereof", and many like expressions. It would take years to search out all ascriptions of honor, and glory, and power, and many other attributes, all of which are a part of His fathomless wealth and are never capable of being fully traced out.