As Rhetorician has said, it is the greater work of bringing souls to salvation. Just before Christ died, after His ministry of, debatably, three and a half years, there were about one hundred and twenty believers (Acts 1:15) in Jerusalem, and some elsewhere (eg at Sychar in Samaria). When Peter preached at Pentecost, on the first day of receiving the Holy Spirit, about three thousand souls were added to their number (Acts 2:41).
That is the greater works.
The miraculous healings of the New Testament era, apart from those of our Lord, were done only by the Apostles and by two of their close band.. Stephen and Phillip. The only other miraculous healing was by the restoration of sight to Saul by Ananias (Acts 9:17). That's it. Notice the following verses:-
Then fear came upon every soul, and many wonders and signs were done through the apostles. (Acts 2:43)
And through the hands of the apostles many signs and wonders were done among the people. And they were all with one accord in Solomon’s Porch. (Acts 5:12)
Truly the signs of an apostle were accomplished among you with all perseverance, in signs and wonders and mighty deeds. (2 Corinthians 12:12).
They were the signs of an Apostle, not of all believers, or many believers.
how shall we escape if we neglect so great a salvation, which at the first began to be spoken by the Lord, and was confirmed to us by those who heard him, God also bearing witness both with signs and wonders, with various miracles, and gifts of the Holy Spirit, according to His own will? (Hebrews 2:3-4)
And if there were some who had gifts of miracles, signs and wonders then we should expect to see them named in the following verse:
And He Himself gave some to be apostles, some prophets, some evangelists, and some pastors and teachers, for the equipping of the saints for the work of ministry, for the edifying of the body of Christ (Ephesians 4:11-12)
And then we discover Paul who had power to raise the dead at an earlier stage lost the power to heal Timothy, advising take a little wine for the sake of your frequent illnesses (1 Timothy 5:23)... and
Trophimus: Trophimus I left in Miletus sick (2 Timothy 4:20).... and
Epaphroditus: Yet I considered it necessary to send to you Epaphroditus, my brother, fellow worker, and fellow soldier, but your messenger and the one who ministered to my need; since he was longing for you all, and was distressed because you had heard that he was sick. (Phil 2:24-26)
Finally when a believer was sick they were not to call for a worker of miracles or a wonder worker, they were to call for the ordinarily appointed elders of the church who were chosen on the basis of their spirituality (1 Timothy 3:1-7). These are the ones to call:
Is anyone among you sick? 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 will save the sick, and the Lord will raise him up. And if he has committed sins, he will be forgiven. (James 5:14-15)
Cessationists believe that the greater works means effective preaching of the Gospel with the aid of the Holy Spirit; the continuing works of miraculous gifts and healings is a myth.
The sign miracles were the work of the apostles and a few of their band only. And only those who were eye witnesses of the resurrection could be an Apostle (Acts 1:21-26) who are by their writings along with the Old Testament prophets the foundation of the church (Ephesians 2:20).
And the Word of God explicitly tells us that the last of the Apostles was the Apostle Paul:
After that He was seen by James, then by all the apostles. Then last of all He was seen by me also, as by one born out of due time. For I am the least of the apostles, who am not worthy to be called an apostle, because I persecuted the church of God. (1 Corinthians 15:7-9)
There are no more Apostles, nor Prophets, nor the signs of Apostles (2 Cor 12:12) which were given to authenticate their message of the Gospel.
[[I have used "Proving the Charismatic gifts have ceased" by Dr Peter Masters, a 50 pence booklet from the Tabernacle Bookshop, Metropolitan Tabernacle, Elephant & Castle, London. Tel: UK 0207 735 7076]]