How wonderful that Patanjali put Self-Study or Svadhyaya on the TO DO list!  As the third Niyama (observance) of the Yoga Sutras, Svadhyaya has traditionally meant the study of scripture or the practice of personal mantra. Through the lens of modern psychology it is now commonly practiced as the examination of thoughts, emotions, and behavioral patterns. These understandings of Svadhyaya are valid and worthwhile.