'Sphere' in the Bible

But we will not boast beyond our measure, but within the measure of the sphere which God apportioned to us as a measure, to reach even as far as you.

We are not boasting about work done by others that cannot be evaluated. On the contrary, we cherish the hope that your faith may continue to grow and enlarge our sphere of action among you until it overflows.

so as to preach the gospel even to the regions beyond you, and not to boast in what has been accomplished in the sphere of another.