Reading through Augustine's Confessions is a great way to see how to relate to God. The whole book is written like a prayer in the third person- it's a demonstration of how to pour out your heart to the Lord.
Below is a quote where Augustine explains that sin is neglecting the higher good (God), while giving preference to inferior delights. (Maybe C. S. Lewis was thinking of this part of the Confessions when writing The Weight of Glory).
'The life that we live here has its own peculiar attractiveness, and allure all its own, especially in its harmony with the rest of the creation. The bond of human friendship has a sweetness of its own, binding many souls together as one. Yet because of these things we value, sin is committed. We have an inordinate preference for these things of a lower order while neglecting the better and the higher good. We neglect You, Lord God- Your truth, and Your law.
While these inferior things we value have their delights, none are equal to You. For in You, O God, the righteous delight and You are the sweetness of the upright in heart.'