As we have taken the circle as a symbol of reason and madness, we may very well take the cross as a symbol at once of mystery and health. Buddhism is centripetal, but Christianity is centrifugal: it breaks out. For the circle is perfect and infinite in its nature; but it is fixed for ever in its size; it can never be larger or smaller. But the cross, though it has at its head a collision and a contradiction, can extend its four arms for ever without altering its shape. Because is has a paradox in its center it can grow without changing. The circle returns upon itself and is bound. The cross opens its arms to the four winds; it is a signpost for free travelers.