Ho Hsian Ku, a Taoist immortal

The Tao Teh King: A Short Study in Comparative Religion by C. Spurgeon Medhurst [1905]

There are dozens, perhaps hundreds of translations of the Tao te Ching, the root sacred text of Taoism, one of the three traditional religions of China. This one, written by an ex-missionary who appears to have had Theosophical leanings, includes extensive notes on similarities with other religions, primarily Christianity, but also Buddhism and Hinduism. This gives a new way of looking at this multi-faceted text, which has always had appeal to mystics of all persuasions.