Paul explains that he is called to convert and strengthen gentiles. Paul knows he is not writing to a novice community but to one who knows and practices the faith – they are full of “goodness” v.14.
While Paul never hesitates to affirm his position of authority and responsibility as the one to whom “grace was given” there is a humble aspect to his statement as he affirms his complete dependence on the Lord. v.18-19
So what principles can we extract from the verses for today? One clear principle is successful ministry is always God’s doing. Since we all are part of a ministry, perhaps today you can consider your ministry and how God has enabled you to be successful or what you need to do to allow God to work through you.