God: "I looked for someone to take a stand for me, and stand in the gap" (Ezekiel 22:30)
A miracle is God's direct, sovereign intervention into the natural world. It is an event so contrary to the normal course of events that there is no scientific or naturalistic explanation for it other than the power of God. There is no natural insight to explain the parting of the Red Sea, restoring the sight of those blind from birth, or raising people from the dead.
The call to evangelism is a call to turn our lives outward from focusing on ourselves and our needs to focusing on God and on others made in His image who are still at enmity with Him, alienated from Him, and in need of salvation from sin and guilt.