'Excellence' in the Bible

When I came to you, brothers, I didn't come with excellence of speech or of wisdom, proclaiming to you the testimony of God.

But I will come to you soon, if the Lord is willing, and I will find out not just the talk of these arrogant people, but [evaluate] their [spiritual] power [whether they live up to their own claims].

For the kingdom of God is not based on talk but on power.

But desire earnestly the greater gifts, and yet shew I unto you a way of more surpassing excellence.