For those who like to prepare, our sutra focus will be 1-36:

Concentration may also be attained by fixing the mind upon Inner Light, which is beyond sorrow

This translation if from Swami Prabhavananda and Christopher Isherwood, from How to Know God: The Yoga Aphorisms of Patanjali.  Explore various versions of 1-36, and bring your own reflections to class if you feel moved!