Matthew sprained his ankle playing football. The doctor told him to get off his crutches as soon as possible, because the injury would develop scar tissue if he did not walk on it. If an injury develops scar tissue, later on it can be worse and more painful and you lose mobility.
Some people live with "injuries" in the lives and never experience forgiveness. They are spiritually crippled because they either will not receive forgivenss from God or give it to others.