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Nowadays, we often mistake the difficulties of being a believer, locating them in the wrong place. Faith is not what we imagine. What it certainly is not is the virtue of easy tranquillity rather that of a pilgrimage, an exodus, crises, the passage from the imperfect to the better. There is a time in everyone's life when it seems necessary to explain our faith. In spite of everything, it is impossible to be satisfied with all the answers given to our questions. Another good reason for trying to understand.