I read this quotation from Paul Tournier several years ago in Brian MacLaren's A New Kind of Christian and it has meant a great deal to me since. I love it because of the unique way it depicts obedience: as discovering and being who and what we are meant to be.
The meaning of life, its total meaning, which imparts
to it its unity despite the diversity of its various stages, is
obedience to God. In growing up and developing, the child is obeying
God, who gave him life and its wonderful power of growth. In making his
choices, the adolescent is obeying God, who granted him the liberty to
choose and the responsibility of choice. In throwing himself
passionately into all his creative adventures, the adult is obeying God,
who has made him in His own image. And in detaching himself from
particular things and ephemeral actions, and attaching himself instead
to transcendent values, in accepting his human condition, necessarily
fragile, temporary, limited, and incomplete, the aged person is still
obeying God, who made men "strangers and exiles on the earth."