James Allen reviewed this book saying:
This is a philosophical work of great power and depth. The author deals with states of consciousness, and he belongs to the new school of thinkers who work from the spiritual basis. To him the invisible realities are of primary importance, as is seen by the following quotation:—"We see outwardly just what we are outwardly conditioned to see by reason of the status of our own consciousness: and if we could see otherwise, it must be primarily, through the cultivation of a different quality or degree of consciousness, rather than through the substitution of different external conditions." The section on "Christianity" is particularly fine, and should be carefully studied by those who are looking for a more universal interpretation of the mission of Jesus than at present obtains in the multitude of creeds.