In the center of a pulley there is a groove, in which a rope or a cord passes through. The pulley acts to change direction of a cord or the rope with a weight attached to one side of some sort. If the force or pressure is sufficient enough, the weighted object will rise up. But if insufficient force is applied, that weighted object won’t budge, but abide.
By faith apply sufficient force against you flesh, by consuming the word of God, and enter into rest.
Hebrews 4:11
11Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief