Miracles are not only possible but are matters of fact. Whether they occurred by the actions of Christ Himself or by those to whom He bestowed a portion of His power, one has to accept that the Word (John 1: 1) who made all things seen and unseen and without who, nothing was made that was made, is able to manipulate the quantum-mechanical aspects of the universe He created in order to achieve whatever outcome He desires.
However, inward sight alone can convince of spiritual truths but wonders and miracles themselves, never.
The Miracles of Jesus were small when compared to the continuous, life sustaining, all embracing works of His Father and were made small so that we might better understand them. Poor indeed was the miraculous making of wine in the stone jars at the marriage feast in Cana when compared to the abundant growth of vines throughout the world with their clusters of ripening grapes, gathering from the earth the water that had to be carried in pitchers and then poured into the stone jars at Cana.
The same can be said with the feeding of the five thousand from a few loaves and fishes. In each case with Jesus' miracles they were always a reflection of the life sustaining works of God. Stones were not turned into either bread or fish but existing bread and fish were multiplied to abundance as exhibited by the baskets of leftovers that were gathered up afterwards.
Disbelieve miracles and the Resurrection itself, the greatest miracle of all, would have to be disbelieved.
Email Questions and Comments to - Faith@christisforall.co.uk