In this paralytic the whole Gentile world is offered for healing, he is therefore brought by the ministration of Angels; he is called Son, because he is God's work; the sins of his soul which the Law could not remit are remitted him; for faith only justifies. Lastly, he shows the power of the resurrection, by taking up his bed, teaching that all sickness shall then be no more found in the body.
Source: Catena Aurea by Aquinas