From John Piper:
Lead somebody to Christ. Live a holy life. Don't lose your faith when you get cancer. Bring up your kid to love Christ. Do something radical for missions.
The common denominator for all of those is that you prove by your life that I haven't wasted mine.
Don't give me a Rolls-Royce when I turn sixty. I would've wasted my life if you think you're blessing me with some big financial gift when I'm sixty. I want to see your life changed. I want to see you pour yourself out for others. And I'm sure that's what you're asking about.
I get in prayer meetings and listen to my people pray, and I say, "That's what I'm living for."
They're holding on to Jesus. Life is falling apart for them over here, but they're not giving up on the Lord. They're rejoicing in him. Or I hear a man tell about how he shared Christ at his work.
Those are the things that make a pastor endure anything.