At the 2013 commencement speech at MIT, Drew Houston, the founder of Dropbox said:

When I think about it, the happiest and most successful people I know don't just love what they do, they're obsessed with solving an important problem, something that matters to them. They remind me of a dog chasing a tennis ball: Their eyes go a little crazy, the leash snaps and they go bounding off, plowing through whatever gets in the way … So it's not about pushing yourself; it's about finding your tennis ball, the thing that pulls you.

So what is your tennis ball?

Possible Preaching Angles: (1) Work; Vocation; Calling; (2) Worth; Worship; Jesus Christ—This image also applies to how we should pursue and worship Christ. Obviously, Jesus is more than a tennis ball! And yet, he is the prize, the treasure, the goal that pulls us in our Christian life.