In the Gospel, Jesus, by forgiving the paralytics sins and curing him, indicates that he is inaugurating the Messianic age promised by Isaiah in the first reading. But Jesus is only inaugurating the Kingdom, he is not establishing it in its fullness. Sin still mingles with good in this world, the selfish lust for wealth and power lives side by side with and contradicts the Messianic values: widespread abundance equally shared by all, health of body and spirit, wholeness.
The chosen peoples journey back to Jerusalem required first of all a conversion: sorrow for sins, a determination to live a new and committed life, forgiveness by God. In the Gospel youll find the same reality: the paralytic is cured of his affliction only after his sins had been forgiven.