Even if you lose the war, don't lose the lesson.
Don't make detailed plans. Too many variables. Make rough plans and then adapt.
Don't panic. Drop the anchor when your boat is in the middle of a storm and wait for it to pass.
When you need to tell someone something pick a moment when they are in a place to listen, rather than when it's convenient for you to say it.
Love isn't about how much you can get, it's about how much you can give.
A simple test for a good person is how they treat those who they have nothing to gain from.
Be aware that there are unknown unknowns – things you don't know that you don't know.
Unfortunately, as it often happens, there is nothing more permanent than a temporary solution.
It'll get tougher and tougher, until it becomes very easy. Keep at it. Don't give up. Try again. You fail only when you stop trying.
Every once in a while look at yourself from a distance. As if you are looking at someone else.