back in high school my trigonometry teacher, a preacher, always said this and I won't ever forget it:
-do not assume (in math and in life)
18 years later I bump into him when I was subbing a class and let him know how those words always stuck with me,
and he just smiled.
also,
-you suffer more in imagination than in reality.
-focus on what you can control (or, what you think and your actions)
pretty much the whole stoic school of thought is pretty neat.
let's keep this thread going