“Buddhism is centripetal, but Christianity is centrifugal: it breaks out.  For the circle is perfect and infinite in its nature; but it is fixed forever in its size; it can never be larger or smaller.  But the cross, though it has at its heart a collision and a contradiction, can extend its four arms forever without altering its shape.  Because it has a paradox in its centre 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.”

-Philip Yancey, G. K. Chesterton – Orthodoxy, p. 32