"Stay in the yellow."
That's the best tip I ever got. It came from a mentor of mine, a Vietnam-era retired Special Forces colonel [disclosure: I am not and was never in the Special Forces]. Too often in life, we are just trudging along with blinders on, not really paying attention to what's going on... unprepared. In so many ways; yes, not only in combat. That's called being in the "white." Totally oblivious. But being "in the yellow" means to increase your awareness just a hair at all times; to pay attention to the stuff going on around you. To pay attention to the way your loved ones are feeling. To pay attention to how people around you are reacting to your words and actions. To pay attention when you're crossing the road, taking out your wallet, and yes... walking across a rice paddy in Vietnam. And that way, you won't ever have to go straight from white to black. Being in the "Black" is when you're suddenly in full-on combat. But being in the "black" can also be when you unintentionally piss someone off or hurt someone you love because you weren't staying aware of what was going on around you; you were daydreaming. My mentor was telling me to stop daydreaming and ignoring things around me... he was telling me to stay aware of the real world around me... just a little bit... to stay in the yellow.
Since I got that advice and really understood what he meant, my life has been happier and more fulfilling. I now live my life more aware of what's going on around me. Being more aware than the average person has saved my bacon financially, emotionally, and professionally. That was 10 years ago, almost to the day, summer of 2002. God bless him, col. (retired) Jim Callahan, U.S. Army Special Forces.