In "God's Word for Today" Steve Oliver writes:
Compromise happens when we allow our interactions with this world to undermine our loyalty to Christ or our obedience to His commands. Although it may end with something flagrantly wrong, compromise begins small and is often almost unnoticed. It begins, not in our actions, but in our attitudes — envy at our neighbor's possessions indicate a worldly attitude of materialism. A sense of shame that our projects do not look like the Pinterest photos indicates that we are valuing ourselves by comparison to others.
Source: Christ, the Triumphant Lord: Adult Teacher's Insights, page 16.