ISB ~ Matthew 9 v6

that you may know:Since forgiveness cannot be verified by his audience, Jesus demonstrates his power by healing the man. His authority over paralysis points beyond the body— it signifies his ability to cure the soul. The OT indicates that bodily sickness is sometimes tangible evidence of sin (Ps 107:17; Is 33:24; cf. Jn 5:14; 9:2).

• Anagogically (St. Ambrose, In Luc.), the healing of the paralytic signifies the future resurrection of the faithful. The paralytic is the Christian whose sins are forgiven and who stands before God as son (9:2). When the Lord raises him (9:7), he will take up the bed of his body (9:7) and proceed to his heavenly home with God (9:6; cf. Jn 14:2-3).