So then faith comes by hearing, and hearing by the word of God. - Rom 10:17
The Spirit itself bears witness with our spirit, that we are the children of God: - Rom 8:16
These two verses speak to the miraculous event that occurs when we are BornAgain. We Hear the Word, the HolySpirit bears witness to that Word and we Know that we are now InChrist.
But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you. - Joh 14:26
When the HolySpirit 'teaches' us He does not teach through our Minds. He teaches our Hearts which gives Revelation to our Minds.
Those things which we Know only in our Mind are often unsettled. We have to sort those things and mull over those things to give them meaning and application for our lives. Things known only in our Mind can also be completely ignored.
However, those things that have been revealed to us by the HolySpirit we Know in our Heart.
Keep your heart with all diligence; for out of it are the issues of life. - Pro 4:23
This verse tells us that 'the issues of life' are determined by our Heart.
Specifically, Spiritual Healing, i.e. the NewBirth manifests from our Hearts with the testimony that Jesus is the Son of God, that He has been raised from the dead and that He is our Lord and Saviour.
Likewise, Physical Healing manifests from our Hearts with the heart-generated testimony that we have been healed by the stripes which Jesus bore.
If the testimony for either Spiritual or Physical Healing is from our Minds (but not our Hearts) it is empty and powerless.
That if you shall confess with your mouth the Lord Jesus, and shall believe in your heart that God has raised him from the dead, you shall be saved.
For with the heart man believes unto righteousness; and with the mouth confession is made unto salvation. - Rom 10:9,10
HeartFaith comes by SpiritualHearing. The HolySpirit must reveal to us the Truth so that there ceases to be a struggle to Believe and we begin in fact to Know in our Hearts.
How do we promote SpiritualHearing? We meditate on the Word and Pray in the Spirit. Fasting serves to suppress the Flesh enabling clearer SpiritualHearing.