Here's a quote that didn't make it into the Sunday Sermon in Esther, on God's sovereignty. It's from J.I. Packer's Book Evangelism and the Sovereignty of God. I thought it might be helpful to fill out questions you might have regarding the subject.
“Evangelism, we have learned, is a task appointed to all God’s people everywhere. It is the task of communicating a message from the Creator to rebel mankind.
The message begins with information and ends with an invitation. The information concerns God’s work of making His Son a perfect Saviour for sinners. The invitation is God’s summons to mankind generally to come to the Saviour and find life. God commands all men everywhere to repent, and promises forgiveness and restoration to all who do. The Christian is sent into the world as God’s herald and Christ’s ambassador, to broadcast this message as widely as he can. This is both his duty (because God commands it, and love to our neighbor requires it) and his privilege (because it is a great thing to speak for God, and to take our neighbor the remedy - the only remedy- that can save him from the terrors of spiritual death.)
Our job, then, is to go to our fellow men and tell them the gospel of Christ, and try by every means to make it clear to them; to remove as best we can any difficulties that they may find in it, to impress them with its seriousness, and to urge them to respond to it. This is our abiding responsibility; it is a basic part of our Christian calling.”