After admitting that he was chief among sinners (15), Paul then writes that despite his low state he received mercy from God. This truth can be seen both in his conversion in Acts 9, and in his many personal explanations of that conversion to Christ.
Here he states why that mercy was shown to him. So that in him Jesus Christ’s longsuffering could be demonstrated. If God was willing to save the most violent and zealous enemy of the faith, and then use him as a preeminent apologist for that same faith, it is obvious that anyone who accepts Christ can be forgiven. This is a truth that gives hope to all.
It is for this reason in verse 17 Paul praises God so graciously in this spontaneous expression of praise. He is eternal and immortal — without beginning or end. He is invisible—indicating His spiritual and divine nature. And He is wise to an extent that defies comparison.
For these reasons He is worthy of the praise of our lips and pens.
