Having devoted the first 50 lines (or 25%) of the Yoga Sutras to the science behind meditating (the intent, types of thought, importance of correct thinking, the four stages of mental awareness, etc.), Patanjali devotes the entire second chapter (the next 50 lines, or 25% of the poem) to PREPARING to meditate. Chapter two describes the constant, routine stress-reducing practices of Raja Yoga: 1) fostering and maintaining a positive attitude, 2) following the Golden Rule and Serenity Prayer, and 3) exercising your body and mind to increase self control and reduce stress and fatigue.