Inasmuch as I am the apostle to the Gentiles, I glory in my ministry in order to make my race jealous and thus save some of them.Many of the Jews had rejected Jesus. So Paul went to preach to the Gentiles, knowing that this would make the Jews jealous and willing to accept the teaching of Christ.
- Romans 11:13-14
We are also called to evangelize to others, and like St Paul, we can use a form of jealousy to do it. When we live a truly faith-filled life, we can't help but let our joy shine through. There is always something to be grateful for. There are always blessings to count. When trouble comes our way, we can face it with confidence, knowing God is there to help us. Our souls are at peace, knowing there are wonderful things to come.
When others see how our lives are filled with joy, peace and confidence, they will want to know where it comes from. And they will want it too. They will long to have what we have, and that is the first step on a journey to faith.
I know this method works, because it was part of the reason I myself was converted. So live a faith-filled life, and be prepared to make someone jealous today.