Again, the light that illumined St Paul on the road to Damaskos (cf. Acts 9:3), the light through which he was raised to the third heaven where he heard unutterable mysteries (cf. 2 Cor. 12:4), was not merely the enlightenment of conceptual images or of spiritual knowledge. It was the effulgence of the power of the Holy Spirit shining in His own person in the soul.
Such was its brilliance that corporeal eyes were not able to bear it and were blinded (cf. Acts 9:8); and through it all spiritual knowledge is revealed and God is truly known by the worthy and loving soul.