Book excerpt: The four types of yoga are covered in length in the current book, along with its philosophy, psychology, and practise techniques. It provides a comparison of the four yogas, outlining their similarities and distinctions. By destroying the ego, karma yoga, also known as the yoga of selfless action, aims to address the issue of ignorance. We are tethered to this world by attachment because of the ego, which was born out of ignorance. The practise of bhakti yoga involves inward purification. Bhakti-central yoga's thesis is that love is the most fundamental human emotion. Love is cosmocentric and divinely inspired in its most pure form. Raja-yoga ignites the flame of awareness of the self within in order to reach the Divine.