The Spiral of Purity is an ever increasing thrust for a more extreme position
generated by mutual competition between those in the affected group.
The whole group may share a particular viewpoint until one carries
that viewpoint a step further from the unenlightened view
and so causes others in that enlightened group to follow
rather than be thought outside the membership.

It is a pernicious group relationship
built on mutual competition,
rather than on love.

It is easy to see such a Spiral in many Christian activities.
The competitive nature of group prayer, visible holiness,
of spirituality or use of Spiritual Gifts.
Those that pray "in tongues" more
or hold up holy hands.

In past times such a Spiral has split the church
again and again in mutual antagonism.
It will, sadly but inevitably,
happen repeatedly whilst
any church survives.