20 And He is called the Comforter, because He comforts and encourages us, and helps our infirmities; for we know not what we should pray for as we ought; but the Spirit Himself makes intercession for us, with groanings which cannot be uttered, that is, makes intercession to God. Oftentimes a man for Christ's sake has been outraged and dishonoured unjustly; martyrdom is at hand; tortures on every side, and fire, and sword, and savage beasts, and the pit. But the Holy Ghost softly whispers to him, “Wait on the Lord, O man; what is now befalling you is a small matter, the reward will be great. Suffer a little while, and you shall be with Angels for ever. The sufferings of this present time art not worthy to be compared with the glory which shall be revealed in us.” He portrays to the man the kingdom of heaven; He gives him a glimpse of the paradise of delight; and the martyrs, whose bodily countenances are of necessity turned to their judges, but who in spirit are already in Paradise, despise those hardships which are seen.
Source: Catechetical Lectures (New Advent)