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.