Everyone wants to feel important and valued, not only by peers but more so by leadership. So when leadership, a pastor or superior tells you (and only you) something that needs to get done, you feel valued. "I'm the only one he's told this to, I must be important."
We may not intentionally say that in our minds, but that's how we feel. The problem is, rarely does a task involve one person. That thing that needs to get done involves multiple people on your team, but if you share it with them, you lose that exclusive knowledge and feel equal to your peers. You're no longer exclusive.
By keeping it to yourself though, you're also 100% responsible for its completion. This kind of keep it to yourself mentality is not sustainable, as balls will begin to drop on account of no one knowing what's going on. While it's great to feel valued and important, the priority is always excellence. Every task, for any business, should be completed with excellence, and having multiple eyes and hands in a large project will increase the likelihood of success.
Don't keep valuable information to yourself. Value is measured by your ability to execute, not the ability to keep things to yourself. Have open communication with your team; don't keep them in the dark.