J. I. Packer on Evangelism

"'Whenever I am justified in choosing my subject of conversation with another, the theme of themes (Christ) shall have prominence between us, so that I may learn of his need, and if possible, meet it.' The key words here are: 'whenever I am justified in choosing my subject of conversation with another'. They remind us, first, that personal evangelism, like all our dealings with our fellow-men, should be courteous. And they remind us, second, that personal evangelism needs normally to be founded on friendship. You are not usually justified in choosing the subject of conversation with another till you have already begun to give yourself to him in friendship and established a relationship with him in which he feels that you respect him, and are interested in him, and are treating him as a human being, and not just as some kind of 'case'. -J. I. Packer from Evangelism and the Sovereignty of God