“To godliness, brotherly kindness; and to brotherly kindness, love”
The first five virtues of verses 5-7 deal with our inner being—the last three deal with others. “Godliness” is the last of challenges to our inner life.
The word “godliness” was also used in 1:3 (see our study there) and used in 2 Peter 3:11. This is a word for piety but piety toward God; It carries the idea of reverence toward God.
An essential dimension to the Christian life is reverence for God.
The idea of piety in Scripture is not moroseness or sullen solitary mode of life. It has to do with keeping close touch with God, which produces a God-likeness.