"As you sow, you shall reap"

Cap. 4 Date la buena vida

In my opinion, Savater is right when he thinks that his son should use his freedom to live a good life which is indeed to have a good human life, that is to say, a life among human beings in a process of reciprocity with each other.
I think that we live a good life when we do the right thing to others because in that way we feel good. Nor should we forget that "As you sow, you shall reap".
So I would like to mention the prayer of Saint Francis Assisi who gave up his wealthy life to live a good one and whose words are so moving that I appreciate them most. They are an example of how we should live:

Lord, make me an instrument of your peace.
Where, there is hatred, let me sow love;
where, there is injury, pardon;
where, there is doubt, faith;
where, there is despair, hope:
where, there is darkness, light;
and where there is sadness, joy.
Oh Divine Master, grant that I may not so much seek
to be consoled as to console;
to be understood as to understand;
to be loved as to love.
For it is in giving that we receive;
it is in pardoning that we are pardoned;
and it is in dying that we are born to eternal life. Amen.

With regard to the last sentence, I think that it sums up what is to humanize because it is in dying to our mistreatments (egoisms, hate, incomprehensions, lack of love, etc) that we have our reward even on the earth.