"Descending into a deep cavern, one prefers to have a bright and even-burning lamp, rather than a smoky sputtering torch. It is the same with the quality of psychic energy. The sparks of a smoky flare do not improve a situation. But how to attain an even light? Only by constant meditation about the basic energy. Like a wordless mental process, in the rhythm of the heart the inextinguishable Light is strengthened. (591)"