In the thirteenth century, to the communicant on his knees about to receive the sacrament, the Host often faded out of sight; it disappeared, and, in its place, appeared an infant or the radiant features of the Savior and, according to the Church doctors, this was not an illusion but an illumination.[5316] The veil had lifted, and the soul found itself face to face with its object, Jesus Christ present in Eucharist. This was second sight, infinitely superior in certainty and reach to the former, a direct, full view granted by grace from above, a supernatural view.--By this example, which is an extreme case, we comprehend in what faith consists. It is an extraordinary faculty operating alongside of and often in conjunction with our natural faculties; over and above things as our observation naturally presents them to us, it reveals to us a beyond, a majestic, grandiose world, the only one truly real and of which ours is but the temporary veil. In the depths of the soul, much below the superficial crust of which we have any conscience,[5317] impressions have accumulated like subterranean waters. There, under the surging heat of innate instincts, a living spring has burst forth, growing and bubbling in the obscurity; let a shock or a fissure intervene and it suddenly sprouts up and forces its way above the surface; the man who has this within him and in whom it overflows is amazed at the inundation and no longer recognizes himself; the visible field of his conscience is completely changed and renewed; in place of his former and vacillating and scattered thoughts he finds an irresistible and coherent belief, a precise conception, and intense picture, a passionate affirmation, sometimes even positive perceptions of a species apart and which come to him not from without but from within, not alone mere mental suggestions, like the dialogues of the "Imitation" and the "intellectual locutions" of the mystics, but veritable physical sensations like the details of the visions of Saint Theresa, the articulate voices of Joan of Arc and the bodily stigmata of Saint Francis.