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Letter 10] ultimately find a perfect fulfillment in a harmonious cooperation with the divine Love and in the unending contemplation of the divine Glory. Nor are illusions without a present practical purpose. Men are more hopeful, more active, more loving on account of them. On the other hand, even optimists must acknowledge that no man should shut his eyes to the truth in order to remain in what he knows to be no more than a comfortable error. The venial illusions of childhood, youth, and ignorance, become unpardonable or hypocritical in experienced age. Do you ask how we are to distinguish "illusions" from "delusions"? The answer is easy—on paper; but, in practice, often difficult to apply. However, the test is the same as that by which we distinguish knowledge from ignorance. Illusions "work"; that is to say, men are on the whole the better for them, and they prepare the way for truth. Delusions fail; men are in no way the better for them, and they often prepare the way for insanity and for physical or spiritual death.

We have spoken of moral illusions; let us touch on another kind of illusions to which some (I do not say rightly) have given the name of "illusions of sense."

I doubt whether the name is correctly given; for to me it seems that the illusion proceeds not from the senses (which, as far as I can judge, never deceive us) but from the imaginations and inferences which we base upon the report of the senses. Take an extreme case, fit rather to be called "delusion" than "illusion." If I see the phantom of a cat before the fire, which cat nobody else in the room can see, do my senses deceive me? No; but I am deceived by the imaginative inference which leads me to assume from past experience that the object which I see is visible to, and can be touched by, everybody else. My visual sense (which has to do with images only) reports—and can do no otherwise—that it discerns the image of a