What is the most important thing in life?

By far the most important thing in life is to be alive. We could include air, water, food, clothing, health, freedom, family, etc..
Many things are important in life, and since we put this question is that we live, we are not hungry or thirsty, or killed by any disease.
So go to another level: the questions. "Where we come from and where are we going?" And "how do we get up there?"
Probably what every man already knows in his mind: to be good, to help others, not hurt anyone, to love and be loved, to do something good with your life, have children and raise them as need and train them ... Each one, in his right must find the solution.