How can I make them see their errors?

Every parent and friend (and spouse) has felt this... I see their sin but they don't... I've never thought about Nathan---the guy who God used to help David come to repentance-- as a model for loving others by confronting them in their sin... Paul Tripp does a masterful job reflecting on this:

No shouts
No pointed fingers
No flashing eyes
No red-faced accusations
No inflammatory vocabulary
No bulging forehead veins