There are both bad and good reason for evangelising.
Some bad motives
1. In order to gain glory for yourself. Wanting to be known as a soul-winner among your fellow Christians. Or, you like winning arguments. Or, you wish to cover up your own doubts.
2. Guilt. Take your guilt to the cross and leave it there. Guilt, in addition to being a poor motivator, doesn’t honour the message we have. Be aware of your motives, but don’t wait for them to be perfect before going out to evangelise.
The good motives
There are two of them, found in Matthew 22:36-40: love for God and love for other people.
Love for other people
a. The reality of heaven and hell-Hebrews 9:27. Everyone will be judged–Matthew 25:31-36
b. There’s no other way of salvation–John 11:25-26, 14:6, Romans 10:13-17
Love for God
a. A desire to obey God–John 14:21, 1 John 5:3, Mark 13:10, Matthew28:19, Romans 1:14, 1 Corinthians 9:16-17
b. A desire to imitate Christ–John 3:17, Mark 10:45, Luke 19:10. He came on a mission to seek and save.
c. A desire for the glory of God. God’s motivation is His glory (Ezekiel 36:22-23). Those who don’t know Him are robbing Him of His glory.
And finally, some encouragement:
1. Ask Christians in your church to share their testimony. That way you may hear of the faithfulness of praying parents, friends and strangers.
2. Reflect on the reality of hell, and that those without Christ are going there.
3. Meditate on the beauty of the gospel, and it will overflow from you.
4. Consider the sovereignty of God. We can’t make anyone believe.
5. Consider the cross, and the love shown there.
From a talk given by Mike McKinley at The Gospel and Personal Evangelism Conference held at UCC Dubai, September 2010.