Complex sentence: The metaphor of the shoreless sea reinforces that when away from God one cannot be content, and that there is a clear distinction between the pleasure one receives from worldliness and the true spiritual joy they gain from devoting time to God.
Split into simpler sentences: The metaphor of the shoreless sea reinforces that when away from God, one cannot be content. It portrays a clear distinction between the pleasure one receives from worldliness, and the true spiritual joy they gain from devoting time to God.