ISB ~ John 16 v13

he will guide you:The work of the Spirit counteracts the work of Satan. The former discloses the full meaning of the gospel (14:26); the latter spreads deception and falsehood throughout the world (8:44). The point here is that the Spirit continues the teaching mission of Jesus to bear witness to the truth (8:31-32; 18:37; CCC 687).

• Vatican II outlined the doctrine of magisterial infallibility, meaning that the pope alone or the pope and the bishops united with him are divinely protected from teaching error when they define matters pertaining to faith and morals (Lumen Gentium, 25). The guidance of the Spirit is Christ’s guarantee that the gospel will not be corrupted, distorted, or misunderstood by the ordained shepherds of the Church during her earthly pilgrimage (CCC 768, 889-92). See note on Jn 14:26.