Ephesians 3:8

"To me, though I am the very least of all the saints, this grace was given, to preach to the Gentiles the unsearchable riches of Christ"

Some context: Paul is proclaiming the mystery of the gospel of Christ - namely that He is not only for the Jews but for the Gentiles as well.
How awesome is that! God established before the foundations of the world that Jesus Christ would come and die and be raised to life for the whole world. Paul, in humility, states that although he has been given this task of preaching to the Gentiles, he is the very least. Paul recognizes that it is only because Christ has first saved him that he can preach Christ to those who do not now Him.
Even more amazing is what he is preaching. "The unsearchable riches of Christ". So often I can find myself in this plateaued state of life where I think to myself I know pretty much all there is to know about God. This verse is a great reminder that there is no end to the depth of what can be know about Christ, and even better, it is all RICH. So as Paul is preaching the "unsearchable riches" he is also learning more about them himself. God is infinitely big and unknowable, which makes it so important and awesome to know that I must be continually reading His word and proclaiming Him to others that I may fall into these riches and glorify God because of them.