Everything in life is temporary. So if things are going good, enjoy it because it won't last forever. And if things are going bad, don't worry. It can't last forever either. The best collection of quotes and sayings for every situation in life.
Listen earnestly to anything your children want to tell you, no matter what. If you don't listen eagerly to the "little stuff" when they are little, they won't tell you the big stuff when they are big; because to them, all of it has always been big stuff.