The Law of Undulation, an idea presented by C.S. Lewis in his book The Screwtape Letters: "Their nearest approach to constancy, therefore, is undulation - the repeated return to a level from which they repeatedly fall back."

He argues that humans are constantly going through many different cycles. These cycles exist in our relationships, our interests, and our efficiency at work. In addition, these cycles are experienced in one's relationship with God.

From personal experience this has shown to hold great wisdom, for it explains why when humans want to grow closer to God in their relationship with Him, they repeatedly fall back. This is due to our sinful nature: While we desire to do His will, we cannot. Paul describes this perfectly in Romans 7:15:
"I do not understand what I do. For what I want to do I do not do, but what I hate I do."
This causes much frustration in the Christian walk, because although we have the desire to grow closer to God, we are doomed to repeatedly fall back from Him.

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