Authority on earth to forgive sins

Matthew 9:1-8
Why you entertain evil thoughts in our hearts?
Son of Man has authority on earth to forgive sins.
The man with paralysis. Jesus uses the physical healing as proof of the spiritual cure: the man's forgiveness
Why?
When evil mind in our heart, such as envy, unfair, grieve... We are easy appear the bad motivation.
Jesus is Son of Man, who has authority on earth to forgive sins, and healing diseases.
Man's forgiveness in over the physical healing. Let people has spiritual cure, spiritual free from sins.
How?
Don't always think others are worse and admire their good. Be humble and polite.