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 heart a collision and a contradiction, can extend its four arms for ever 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.