What we approve reflects who and what we are. This is more than weeding out explicitly sinful things, not only the appearance of black amongst the shades of gray, but also anything that smacks of impurity, of dullness in spirit, mind or body, of mediocrity … approving only what’s excellent. (Php 1:10)
Holiness cannot accommodate impurity within. (Ep 4:27) We’re to be adding virtue to our faith (2Pe 1:5); thinking we can behave inconsistently from time to time, making excuses for ourselves, is to rob ourselves of virtue, of excellence.
We become what we behold (2Co 3:18): His excellency is excellent in every conceivable way. Perhaps it is only in feeding in the majesty, in pursuing His excellence, that we learn to recognize the mediocrity within and about us, and to despise it as beneath the image of God.