What had the Lady Jessica to sustain her in her time of trial? Think you carefully on this Bene Gesserit proverb and perhaps you will see: "Any road followed precisely to its end leads precisely nowhere. Climb the mountain just a little bit to test that it's a mountain. From the top of the mountain, you cannot see the mountain."
Attributed to: Princess Irulan
From Chapter 10 of Dune by Herbert, Frank