[I]t is clear that since all time Christianity has, by virtue of its structure, fallen into equilibrium in the direction of the spirit of unification and synthesis: God finally becoming all in all within an atmosphere of pure charity (‘sola caritas’). . . Nevertheless, that is far from meaning that the centric and centrifying character of the movement can be considered as having yet been perfectly defined, either in its mystical expression or in its dogmatic formulation. In the first place, mystically speaking, it is difficult not to be aware of considerable traces of fusionism in the appeals directed towards the inexpressible by an Eckhart or even a John of the Cross: as though, for those great contemplatives, the two isotopes of spirit were still appreciably confused.
Teilhard de Chardin, Pierre (1972-10-18). Activation Of Energy (p. 225). Houghton Mifflin Harcourt. Kindle Edition.