The ability to forgive sins only comes from God. However, should God’s confidential servant and representative request it of God, a person’s sins can be wiped clean. The true devoted servant of God, however, never claims that he is God. The real representative of God continually harkens God’s power, and he desires to do God’s will. Throughout the books written by his disciples, Jesus repeatedly clarifies this position about himself. It was only later, as Constantinople and other Church leaders wanted political control over the Christian world that the opinion that Jesus was God was mandated.
One might wonder why the sins of a paralyzed person were connected to his healing. This is because a person’s current physical situation is the result of his past activities. This law of consequences is a central component of our learning experience within the physical universe. Each of us can make choices in life. Do we help others? Or do we hurt others? Do we give of our selves? Or do we take from others? Do we serve God or do we serve ourselves?
Those actions done with self-centered motives are called "sins."
Every action and decision we make has a consequence. Our actions and decisions are each stored up until they are expressed as physical responses. Sometimes our sins have immediate consequences. Maybe we will go to jail if we steal, for example. Sometimes our sins have delayed responses. Some are expressed in our next lifetimes. They will become part of the next body's DNA and will be expressed as particular diseases or handicaps. In fact, every part of our physical body is a consequence of our past activities - good and bad.
"A man reaps what he sows. The one who sows to please his sinful nature, from that nature will reap destruction; for one who sows to please the Spirit, from the Spirit will reap eternal life." (Galations 6:7)
This is why Jesus saw the sins of the paralyzed man as so important, and why forgiving those sins was vital to his ultimate recovery. Out of his mercy upon the man, Jesus wanted to relieve the person of his past transgressions, so that perhaps his journey back to his relationship with the Supreme Being would be sped up.
This is the nature of the Supreme Being, reflected also by His servants and representatives. As soon as we are ready to have faith in God's existence and a desire to return home to Him, The Supreme Being wants to forgive us of our past behavior. This is a quality of Someone Who truly loves us, and cares for us, and wants us to return to Him.