Ongoing miracles do not exist today because they accomplished the purpose for which they were permitted to occur. I hasten to mention that the same miracles that occurred in the first century remain recorded for us today upon the pages of Scripture. Notice John 20:30-31. “And truly Jesus did many other signs in the presence of His disciples, which are not written in this book; but these are written that you may believe that Jesus is the Christ, the Son of God, and that believing you may have life in His name” (John 20:30-31 NKJV).
The purpose of miracles is stated in Mark 16:20. “And they went out and preached everywhere, the Lord working with them and confirming the word through the accompanying signs. Amen” (emphasis added). Miracles were a means of providing new revelation from God as well as validating that message and the messenger. Miracles were never intended to be permanent, but they were to cease once the new revelation from God that we call the New Testament was complete (1 Corinthians 13:8-12). The imperfect or immature contrasted with the complete or mature in both instances in that context pertains to revelation from God. Once the New Testament was complete, there was no longer a use (according to their purpose) for miracles to continue. Healing, speaking in languages not learned, etc. were byproducts of miracles, not the purpose of miracles.