203 But in all these matters, it is essential that you watch vigilantly lest the enemy come into the field of the Lord and sow cockle among the wheat; in other words, do not let your flocks be deceived by the subtle and dangerous errors of false mysticism or quietism - as you know We have already condemned these errors; also do not let a certain dangerous "humanism" lead them astray, nor let there be introduced a false doctrine destroying the notion of Catholic faith, nor finally an exaggerated zeal for antiquity in matters liturgical. Watch with like diligence lest the false teaching of those be propagated who wrongly think and teach that the glorified human nature of Christ really and continually dwells in the "just" by His presence and that one and numerically the same grace, as they say, unites Christ with the members of His Mystical Body.
Source: Mediator Dei (Vatican.va)