Least favorite : "if I didn't shoot him the neighbors would" which I always respond "maybe they think you're that neighbor" Favorite from my dad when it comes to tracking and backing out on a deer "if he's dead tonight he'll still be dead in the morning.
A sayings that has changed how I hunt. "Don't save your best spots, have enough best spots you're always hunting one." Another is "scout, scout, scout, hunt."