Effectiveness in the gift of healing, for example, depends on God’s sovereign will in answering prayer for healing. Similarly, prophecy depends on the giving of a spontaneous “revelation” (1 Cor. 14:30) from God and simply cannot be exercised at will. The same could even be said about the gift of evangelism: it is ultimately the work of the Holy Spirit to bring regeneration and enable someone to believe, so the evangelist may pray and preach, but only God can give the harvest of souls.
