Among the most important benefits of sobriety: distinguishing between holy and unholy!

Leviticus
Chapter 10: 9-11

"Do not drink wine or intoxicating drink, you, nor your sons with you, when you go into the tabernacle of meeting, lest you die. It shall be a statute forever throughout your generations,  
that you may distinguish between holy and unholy, and between unclean and clean,
and that you may teach the children of Israel all the statutes which the LORD has spoken to them by the hand of Moses."

Bible Gateway link