The church has long sought to engage in evangelism. However, it has not always integrated evangelism with prayer in the way God intended – an oversight that may account for much of the failure of many well-intentioned evangelistic efforts. Attempts to be involved in evangelism with little or no prayer have been discouraging and have yielded limited fruit. Without prayer, God’s people often lack the compassion and the conviction to be effective. If God doesn’t take the initiative in the life of the unbeliever, as He promises to do in response to our prayers, we are limited to human resources and human understanding.
Source: www.lausanne.org