XI

This firm holding back of the senses is what is known as Yoga.
Then one should become watchful, for Yoga comes and goes.

Yoga literally means to join or to unite the lower self with the Higher Self, the object with the subject, the worshipper with God. In order to gain this union, however, one must first disunite oneself from all that scatters the physical, mental and intellectual forces; so the outgoing perceptions must be detached from the external world and indrawn. When this is accomplished through constant practice of concentration and meditation, the union takes place of its own accord. But it may be lost again, unless one is watchful.