2 Corinthians 9:2 - For I know the forwardness of your mind, for which I boast of you to them of Macedonia, that Achaia was ready a year ago; and your zeal hath provoked very many.

If you want to stir up zeal in others, be zealous yourself.  The Corinthians stirred up many for Christ, just by having passion themselves!  I can honestly say that one of the primary things which drew me to Christ was the zeal which certain people I had met had for the Lord.

Zeal is like laughter - it's contagious. Charles Wesley said, “light on fire for God and people will come for miles to watch you burn.” Zeal is like fire: it shines brightly, burns hot, spreads quickly, and is hard to stop when enough is kindled. One zealous person for God can stir up a multitude. “Behold, how great a matter a little fire kindleth!” (James 3:5). So if you want the world to burn hot for God and His Son Jesus, you have to light yourself on fire first (as the Corinthians did) to stir up others.

Revelation 3:16 "'So because you are lukewarm, and neither hot nor cold, I will spit you out of My mouth."

Let us not be lukewarm, but always be growing in passion for the Lord.