We will be able to do greater works, if we believe on Jesus - John 14:12
Verily, verily, I say unto you, He that believeth on me, the works that I do shall he do also; and greater works than these shall he do; because I go unto my Father.
Jesus predicted that those who believed on Him would perform miracles like He did, and even greater works. In the book of Acts, the apostle performed miracles of bodily healing, similar to those of Christ. But they did greater works, such as the conversion of three thousand souls on the Day of Pentecost. Doubtless the greater works are the world-wide proclamation of the gospel, the salvation of many souls, and the advancement of the kingdom of God. It was through the Spirit’s power that the apostles performed these greater works.