A Series of Lessons in Gnani Yoga: The Yoga of Wisdom

This book beautifully lays out the entire Highest Yogi Philosophy. It also parallels that of the Hindu Philosophy of Atman joining Brahman. Yogi Ramacharaka's argument goes to the absolute limits of reason, encompassing every single logical possibility of the nature of reality. His style of argument itself will vastly expand your mind, even if you do not fully grasp his argument. He will make you think on deeper levels than you have ever before thought, and will guide you into these truths ever-so-gently. Beautiful exposition on the nature of reality!