It says that you should be happy in life until you die.

A person that does not have the company of others cannot be happy, he withers up and dies. It is of no use to live without company.

If you are too wise then you can't be happy because you know everything beforehand and you will constantly worry about the bad things that will happen to you and others.

It is important to see the sun and to be warm.

Good health, to live a sensible life and not to be crippled is also important. But if you have bad health then you can still be happy about having a good family, your belongings and jobs well done.