Scaling a mountain, physical, mental, or spiritual, requires overcoming obstacles when the terrain gets difficult. But, if we hope to reach the summit, then we must allow the obstacles on the lower part of our path to increase our grip strength so we don't slip when our path becomes more steep and the weariness of the journey sets in. Genesis 17 talks about a summit for the decedents of Abraham and their need to hold on, and in the same manner Revelations 21 talks about the summit before every Christian.