Please note the following:
CHRIST'S MIRACLES WERE TO DEMONSTRATE THAT HE WAS THE MESSIAH. It is falsely taught in some circles that Jesus performed miracles as an example for Christians to follow. Jesus' healing ministry, they say for example, is held forth as an example of what healers today are doing. This idea ignores the fact that Jesus healed as a sign that He was the Messiah, the promised Savior, the Son of God. Jesus' healing ministry was not an example for us to follow, but was part of His unique credentials as the Christ. In doing supernatural miracle Jesus proved that He was the Son of God and the promised Messiah. He did heal people, but this was not His main reason. The healings showed He had the power to speak and do things that were not natural. Only God could do the things Jesus did and Nicodemus the Pharisee stated this in John 3:1-4. This is plainly what the Bible teaches. Consider the following Scriptures: John. 5:36; 10:25,37-38; 14:11; 15:24; 20:30-31; Acts 2:22.
Some point to Christ's statement in John. 14:12, claiming this means Christians should be able to perform miracles. The fact is that since the time of the Apostles, Christians have not been able to do great sign miracles. It is a fact of history that the sign gifts ceased with the passing of the Apostles. The only "sign miracles" witnessed in church history since those days are those of spurious individuals and groups involved in strange and unscriptural doctrines. Among the faithful people of God through the centuries since the Apostles, sign gifts ceased. Instead, God's people have enjoyed the power of God to live holy lives in the face of a godless generation, to withstand persecution, and to preach the Gospel. God has answered the prayers of his children and at times some were marvelously healed. James however, explained that healing was to be after the miracle age ceased saying, "Is any among you afflicted? let him pray. Is any merry? let him sing psalms. Is any sick among you? let him call for the elders of the church; and let them pray over him, anointing him with oil in the name of the Lord: And the prayer of faith shall save the sick, and the Lord shall raise him up; and if he have committed sins, they shall be forgiven him." (James 5:13-15) That is fact. God's people have continued to experience miracles, but not sign gifts.
Along comes the charismatics and faith healer and TV preachers, all claiming that God is giving sign gifts today. It isn't true. There are no true sign gifts among these groups. Those who claim to be healers cannot heal--at least they cannot heal any more consistently than can any faithful pastor who prays at the bedsides of his people. Those who claim to be prophets cannot prophesy inerrantly. They make mistakes proving they are not prophets of God. They make all sorts of embarrassing mistakes and thereby identify themselves as false prophets. Those who claim to be apostles cannot perform the signs of an apostle which Paul witnessed to in 2 Cor. 12:12--"Truly the signs of an apostle were wrought among you in all patience, in signs, and wonders, and mighty deeds." Jesus and the Apostles preformed the miracle of raising the dead. How many faith healers today claim they can do that. A few have tried to fake it, but they cannot heal. They preform clever tricks that appear to be healings which are proven to be hoaxes.
What then? What about John. 14:12? I believe the promise of Jesus Christ in Jn. 14:12 was fulfilled in the ministry of the Apostles as recorded in the book of Acts. Since those miracle-filled days, there have been no more periods in church history of true sign miracles. That, dear friends, is fact. Those who deny it are flying in the face of Scripture, of history, and of present reality.
THE HEALING MINISTRY OF THE APOSTLES WAS UNIQUE AND WAS FOR THE PURPOSE OF AUTHENTICATING THEIR WORK (2 Co. 12:12; Mk. 3:14-15; Ac. 2:43; 4:33; 5:12,15; 19:12; Heb. 2:3-4). Note that the miracles of the Apostles were special and were for the purpose of marking them as the Apostles of Christ. They had miracle-working power to authenticate their unique ministries. That is what Scripture says. All Christians could not do the sign miracles of the Apostles. The only exceptions were a few men upon whom the Apostles had laid hands. There was no general miracle-working experience among the first churches. If there had been, Paul could not have pointed to his miracle-working ability as a special sign. His merely would have been another miracle-working Christian ministry if all could have performed such things. But all could not. If all could have performed miracles as a matter of course, the Christians would not have called for Peter to come and raise Dorcas from the dead (Ac. 9:36-42). Peter's miracle that day was the "sign of an apostle." It has never been God's will for all Christians to be running around performing sign miracles and healing everyone. That has never been the case, and will never be the case in this age. Don't be deceived. Don't seek that which God has NOT promised and thereby leave yourself open to the deception of the devil. Jesus warned that an evil generation seeks a sign (Mt. 12:39). Let's not be identified with evil. Let us seek those humble things which God HAS promised and which He wants to do in and for and through us to the glory of Christ. Seek to live holy, gentle lives. Seek to preach the Gospel and see souls saved and lives changed for the glory of God. Seek to be looking and longing for Christ's return. Seek to be obedient, fruitful Christians.
Christians are to life by faith putting their trust in God, not healers. They are to live in God's will which often is not to heal, but to comfort, strengthen those who are afflicted. God uses their testimony of faith in the face of adversity to win others to Christ and strengthen the weak in faith. (Most this answer is taken from the "Way of Life Encyclopedia of Christianity and the Bible" by David Cloud. Some material added.)