Legalism and alcoholism

I thought this was excellent (by John Piper):

Legalism is a more dangerous disease than alcoholism because it doesn't look like one.

• Alcoholism makes men fail; legalism helps them succeed in the world.
• Alcoholism makes men depend on the bottle; legalism makes them self-sufficient, depending on no one.
• Alcoholism destroys moral resolve; legalism gives it strength.
• Alcoholics don't feel welcome in church; legalists love to hear their morality extolled in church.