Some people appeal to the “already but not yet” state of the Kingdom of God as an excuse for not receiving healing or miracles. These people have an under-realized eschatology.
The promises of God concerning healing, miracles, and the revelatory gifts are for us today. It is precisely because we are not yet in the eternal state that healing is for us in its fullness. What do I mean?
In the New Heavens and New Earth, there is no more death, no more suffering, and no more disease. Death, the last enemy, would have already been destroyed (1 Corinthians 15:26). But death, disease and suffering still exist in the present age. Therefore all the promises involving healing are available in its fullness only because we live in this fallen present age.
Likewise, 1 Corinthians 13 addresses the cessation of the revelatory gifts. Tongues and prophecy will cease in the New Heavens and Earth when the eternal state comes. But at the present time, our knowledge is not yet in its fullness, and we do not know Christ as he knows us (1 Corinthians 13:12). Thus tongues, prophecies and the other revelatory gifts are available in its fullness only in this present age.
The fact that we are not yet in the eternal “age to come” should not be used as an excuse for our lack of faith in healing, miracles, and the revelatory gifts. Rather, the fact that we are not yet in the eternal state is what makes these things possible. It should spur us to greater faith knowing that the greatest manifestation of these gifts are for us in this present age… yes… in its entirety… precisely because we are in the “not yet”. These are not promises for the future but promises for us today.
The promises of God given to us for today, are for us today!
Also see Vincent Cheung who first wrote about how many professing Christians use the sovereignty of God as an excuse for unbelief.
https://www.vincentcheung.com/2018/05/12/predestination-and-miracles/
A man after God's own heart 