Teachings of Yoga
There are some classic images in Yoga, the illusion of a rope as a snake, for instance, and the metaphor of the chariot as one's body. In addition to these tidbits, Georg Feuerstein offers readers a light, palatable smorgasbord of traditional Yoga teachings from the distant and not-so-distant past.  Most are translated by Feuerstein himself and touch on such themes as liberation, meditation, the human body, bliss of the self, and service to others. It is easy to get bogged down in primary-source readers of this type, but Feuerstein's selections are short and easy to digest.  If you think you might be hungry for more,Teachings of Yogais an excellent jumping off point.