Jesus describes the process of becoming sick...
"Sickness is a decision. It is not a thing that happens to you, quite unsought, which makes you weak and brings you suffering. It is a choice you make, a plan you lay, when for an instant truth arises in your own deluded mind, and all your world appears to totter and prepare to fall. Now are you sick, that truth may go away and threaten your establishments no more."
What happens is, we're in a deluded mindset (ego) and are misperceiving and misinterpreting reality. Then we are exposed to the truth, but in our thought system what is actually true is perceived as "false", because we see truth in what is false and vice versa. That's part of our delusion.
So instead of seeing the truth for how it really is, we see it as an enemy. In particular the ego sees the Holy Spirit as an enemy, just as the ego sees the miracle as an enemy.
By misperceiving the truth, i.e. filtering it and reinterpreting it and coming to a conclusion that it has properties of "falseness", in our twisted thought system this means it is an enemy, or it's evil, or its attacking what we are, or is against us in some way.
The "natural reaction" to this PERCEPTION (albeit a mistaken one), which is totally understandable, is to DEFEND YOURSELF. You tend to want to get away from what you believe is false, and draw yourself towards that which is true for you. Whether or not your idea of truth is back to front or not is a different matter.
So your natural reaction to your OWN misperception of the truth, is to defend yourself, because you see attack IN it, which you have projected onto it. You therefore believe you are seeing an enemy, and you want to escape.
You want to get away from that which you see as false, because it is evil, riddled with darkness, vicious and sure to threaten you. In the interest of preserving your sense of SAFETY, and in effort to DEFEND THE TRUTH (at least, your delusional truth), and in the interests of maintaining your sense of INNOCENCE (albeit mis-identified), you use your creative powers to put up a DEFENSE.
This defense is something you do with your mind. It is resistance. It is denial. It is an attempt to disassociate yourself from the truth, to put distance between you, to emphasize the separation between you and it, and therefore effectively SHUT YOURSELF OFF FROM LIFE. Truth is life, i.e. God, so as you defend yourself against God, you produce the opposite of life - a movement towards death. All forms of sickness are partial deaths. There is not really such a thing as sickness, only life or death - and death is an illusion.
Therefore you believe that you've actually done the right thing, that you've defended yourself, that you've upheld the truth, that you've maintained innocence, and that you've blocked out some vicious murderous God who wants you dead. You really believe that you've actually made a wise move and that you are BETTER OFF being rid of, or having escaped, the terrible monster that you MIS-INTERPRETED the truth as.
As you continue with such delusions, you can drive yourself to death, believing fully that you are all the while defending the truth, upholding innocence, protecting reality, and thwarting the 'real menace' of God. People commit suicide every day. Every person who dies is choosing to die in order to escape from God. Death is a choice for self-murder, to escape Life, because Life has now been wrongly perceived as DEATH. Life and death have been flipped, their roles and meanings inverted, and you are now convinced that dying is actually a choice for life - that it is your SALVATION, and that it will bring you PEACE! Hah.
So you can see how deluded we can be, that the truth contains horrors we do not want. But the fact is, the truth is a blank mirror, in which we see a REFLECTION of all of our own delusional beliefs. When it looks frightening, it is ONLY because it does not support, uphold, or even acknowledge, the egoic belief system and all that it believes in. Thus when we are ego-identified, we believe we are defending ourselves from a separate enemy, but we're actually running away from our own SHADOW.
This is why we need to forgive God, i.e. undo our delusion that illusions are real, or that there is a truth other than God's truth. It is also why we need to have "a little willingness" to be mistaken - that our sense of truth may not be the real truth, and become open to accepting God's truth as our truth - sharing truth with Him. This opens the way for healing miracles. But even moreso, it is the RESURRECTION of the Son of GOd.
The sick are merely delusional and self-deceived in what the truth really is, believing that the opposite is true. They do not realize they are choosing against the truth, and that by doing so it produces sickness. And then sickness seems to come about almost accidentally through mis-creation. Before you know it, you're sick and suffering and heading for death. But this can ALWAYS be corrected, and you can ALWAYS choose again.
Correction is needed, and that is all.
Holy Spirit is the answer. He is here to help awaken you from the ILLUSION that death is real, that death will protect you from death, and that God is evil.
God is love. Love is all there is. Love is what you are.