Gospel ministry is an exciting pursuit, however there are two sides of the ledge to be wary of.

The first is having such a big dream/vision/aim that you struggle with ever being really content in how God is using you. You might have planned to plant a church, start a non-Christian friendly group, ask that guy along to church. And now that thing isn’t happening you might feel really disgruntled. Doesn’t God know all the effort you put into it!?!
That’s dreaming without contentment.

The other is to be so content with how things are that you don’t ever dream. You don’t get excited about how God could use you in the future, how things might be. You’re just too content with the gospel ministry you’re doing at the moment.

Paul was such a good model of this. Paul was anxious for the Philippians (2:28) — who he told not to be anxious (4:6). Paul dreamed of preaching the gospel when no one else had laid a foundation (Rom 15:20). And he also longed to encourage the brothers in Rome just with his presence (1:11). But he was also content with dying and being with Christ (Phil 1:23).

That’s the key isn’t it? Being so ready and willing to die should give us all a new lease on life… and how we might be able to use it for God.