There's no wonder why God moved in such a mighty manner. Evangelism is on the heart of God. The Bible clearly tells us that God's loves a lost and dying world. The world is on the heart of God, and the world ought to be on the hearts of God's people. When it is, then we'll begin to weep for those who've never come to know the Savior.
Prayer is the secret to evangelistic outreach.
Prayer is intimacy with God and when we're intimate with Him, we'll seek His kingdom to come in the hearts and lives of the peoples of the world. Humble, holy, praying men and women have always been God's method of evangelism. He's still looking for such people because prayer prepares the heart of an unbelieving generation. We don't reach people with the message of Christ because we're super salesmen or great orators. We get through to people because the Father has done a deep work in their hearts.