Patanjali Yogasutras is a masterpiece on human psychology, a practical guide for all spiritual aspirants, and a map for spiritual journey. Sage Patanjali codified these sutras on yoga for the benefit of spiritual practitioners. The sutras are arranged in four chapters. I have tried to give the meaning of each sutra and what I understood about them. All spiritual practitioners, especially meditators will understand what the sage was saying when they undergo a particular stage of their spiritual evolution and they happen to read relevant sutras describing that stage. All the wisdom contained in these sutras belong to the Sage and any mistakes in this book are mine.