Our lower bodies are very eager to be mechanical. They like to take over any activity and run it without the conscious participation of the subject. Conscious activity must be our daily goal. Whatever we do, we must be conscious of it.
Mechanicalness uses the etheric body without charging it with psychic energy. Such a mechanical activity wears out the etheric body, and you feel exhausted. This is why in every conscious action you gain energy. Whenever you are “spaced out,” you lose energy.
The Art of Teaching