Jesus went all over Galilee teaching in the [Jewish] synagogues and preaching the good news of the [coming, see verse 17] kingdom, and healing all kinds of disease and sickness among the people.
And I was weak, apprehensive and fearful when I was [there] with you [Note: This probably refers to Paul’s sense of inadequacy in view of the task before him].
Although I must boast about myself [See 11:21-27], it [really] is not profitable. So, I will go on to [tell about] visions and [inspired] revelations given [to me] from the Lord.
Now I rejoice in [spite of] my sufferings for your sake, and I am filling up [i.e., completing] in my physical body what was lacking in the afflictions Christ endured for His body’s sake, the church.