What does the Bible say about the works believers can do?

In John 14:12, our Lord assures the disciples that those who believe in Him will do the works He did and even greater ones, emphasizing the vast number of conversions that would result from the apostles' ministry after Christ's ascension. This promise highlights the spiritual and evangelistic success the apostles would experience, symbolizing not physical miracles but rather the miracle of conversion, which is the greatest work one can witness. The disciples were not left powerless; instead, they were empowered by the Holy Spirit to witness effectively, resulting in significant growth of the early church.