The book contains the elucidation by Swami Abedananda of the main speculative thoughts of Sankhya, Buddhism and Vedanta, dealt in a comparative manner. These lectures were delivered by the Swami in America before the talented audiences.

Besides the systematic philosophies of Sankhya, Buddhism and Vedanta, the Swami has discussed about the spread of Buddhism in China, Japan, Korea and Tibet. The Chapter on Ralph Waldo Emerson's Brahman is very interesting and learned.

The Swami has proved beyond doubt that unity in variety is the best principle of ethics, as the moment we realize that we are one in spirit with the Father in Heaven, we become kind to all, we love all living creatures, and attain to freedom and peace which are the end and aim of all religions and all nations.