Be good at something. It makes you valuable.
Never make a decision until you have to.
Sometimes you can't pay it back, so you just have to pay it forward.
Everyone has to contribute to the common good. To not do so can be described in one word: selfish.
I'll take an earnest person over a hip person every day, because hip is short-term, earnest is long term.
Time is all you have and you may find one day that you have less than you think.