Introduction To Christianity - pg. 264

Because of the Lord's devotion, never more to be revoked
the Church is the institution sanctified by him for ever,
an institution in which the holiness of the Lord
becomes present among men. But it is really and truly
the holiness of the Lord that becomes present in it
and that chooses again and again as the vessel of its
presence - with a paradoxical love - the dirty hands of men.