To enter into the inmost part of his being calls for a terrific struggle, a terrific strength, and a terrific concentration. All his powers need to be called to the task. They must therefore be brought up out of latency and developed to a sufficient degree before the inward journey can even be started, if it is to have any likelihood of success at all. Such development requires systematic working on himself and cannot be left to merely chance and random spontaneity.
-- Notebooks Category 2: Overview of Practicies Involved > Chapter 6: Self-Reflection and Action > # 48