Robert Morris writes in The Blessed Life:

I distinctly remember the first time we ever went out to eat after I had accepted Christ. I found myself wanting somehow to share Jesus with the waitress who was serving us. Then an idea came to me. If I didn't order a meal, I could take that money and leave it as an extra-generous tip along with an evangelistic tract. Maybe the tip would encourage her to read the tract and come to know the Lord. So that's what we did. Before we left, we said a few words to her about how much God cared about her.

About a month later, we were back in that restaurant for our monthly "splurge." Through the month, I had prayed that God would bless us with enough extra money to be able to leave an even bigger tip along with another tract.

Just as I had asked, our faithful God had allowed us to accumulate an extra $50 that we could leave along with a booklet about salvation. That night we requested the same waitress and left her a $50 tip on a $10 meal.

We returned to the restaurant one month later, very eager to see if that waitress was still working there. She was, indeed.

When she saw us, she said, "I read that little booklet you left last time you were here." We tried not to show how excited we were to hear that. She continued, "And I prayed that prayer to receive Christ at the end of it." Of course, we were thrilled to hear that. But she wasn't finished. "Then I called my husband on the phone and read the whole booklet to him, and he prayed that prayer, too."

At that point, I said, "That's wonderful! But what do you mean, you called your husband? Does he travel for a living?"

Looking embarrassed, she said, "No, my husband is in prison. He will get out in two or three years. We both want to thank you for leaving me that booklet and being so generous. Money has been pretty scarce since he went to prison."

Over the next few years, my wife and I discipled this sweet waitress and saw great spiritual growth. We also began to mentor her husband in prison. When he was released, he joined the church with his wife, and they were baptized together. I had the privilege of knowing that the lives and eternal destinies of this couple had been changed because I gave.

And I gave because Christ changed my life.