This sealing is by the Holy Spirit of promise. This promise was given frequently through the ancient prophets, who predicted that when the Messiah came and in virtue of his mediation, God would pour his Spirit on all flesh. John says the Father abides in us, not the Spirit. By the Spirit. By the Spirit-given Word of God.
Bible believers recognize the manifold and widespread miracles of the first century.
Therefore, we ought not be surprised that many passages address this wondrous phenomenon. An introductory glance at Ephesians 4. 1.