A miracle is a supernatural event that occurs when the supernatural realm of God invades the natural realm of life.
This is most often demonstrated in the Bible by the sick being healed instantaneously, the dead rising, bread multiplying, oil reproducing, virgins giving birth, lame walking, blind seeing, lepers cleansing, etc…
And for us who have the very Spirit of God inside of us, and we who have access to the God of the universe every day by prayer and intercession, the question of whether miracles occur today should not be a question among us.
