"I regard [the] book as one of the best–in fact the only first-rate–book in recent years in the field of religion. It gets to the fundamental problem, it honestly sees the weaknesses of contemporary Protestantism, and it attempts to diagnose and cure the evil in the only way a cure can be effected, namely by a doctrine with content at the basic metaphysical level.
"It also goes further than this, recognizing contributions from Oriental religion which simply are not present in contemporary Western religion. More than this it shows how the traditional Western doctrine of the Incarnation and the Atonement can be reconciled with and combined with the intuitive religion of the Orient, such as that of Zen Buddhism. These are exceedingly important and outstanding achievements."–F.S.C. Northrop
"Behold the Spirit
will, I think, prove to be one of the half-dozen most significant books on religion published in the twentieth century."–Canon Iddings Bell