Reflections from the beginning of the Gospel of Matthew
The Kingdom of Heaven is at hand, Repent, be Baptised - and Healing
John the Baptist and then Jesus Christ have the message to repent because the Kingdom of Heaven is at hand, imminent.
The imminence Kingdom of Heaven refers to the fact that soon Man would, for the first time be resurrected and therefore able to inhabit Heaven (a new place and possibility); and therefore it was now time for each Man to repent.
So, the imminent resurrection of Christ allow, makes-possible the imminent resurrection of Men; which means that the Kingdom of Heaven will soon be accessible to Men.
Repentance is now necessary because we will each soon have to make a decision to accept or reject the Kingdom of Heaven - accepting Heaven requires repentance; repentance is this acknowledgement of the need for Christ, that Resurrection is made possible by Christ.
Why the emphasis on Baptism (John the Baptist)? - because Baptism is washing away sin and emergence from the water as rebirth - rebirth is resurrection.
Baptism is a Repentance and the Kingdom of Heaven.
(Baptism ought, therefore, to be by immersion or - at least - by a volume of water washing-over the person, and the person emerging-from the volume of water. Baptism by the - mere - application of water onto the body is an error. Also, Baptism is supposed, ideally (not exclusively) to be done to a person who can appreciate this - not explicitly as theology, but someone who can feel what is happening - can feel the washing and rebirth. For this to be more than just symbolism, the Holy Ghost would need to become operative by this; would need to be welcomed into his heart by the newly-baptised.)
John and the Apostles baptised, but Jesus healed.
Healing is a means to the end - Mortal Man is recognized as intrinsically 'sick', and healing by Christ is a miniature resurrection; and restoration of health by Christ is a miniature of our entry into the (imminent) eternal Kingdom of God.
So a spiritual act of Healing by Christ is a picture of rebirth and resurrection, a story of it - it is the same process, the same sequence of events, as Baptism.
John Baptised, Christ Healed; both were about Repentance and the Kingdom.
To be healed is a repentance, to be restored to health is to be resurrected.
Baptism and Healing were a microcosm of the imminence of Christ's new gift of Man's Resurrection into the Kingdom of Heaven.