'Ability' in the Bible

Not that we are sufficiently qualified in ourselves to claim anything as coming from us, but our sufficiency and qualifications come from God.

For I testify that according to their ability, and beyond their ability, they gave voluntarily,

So now finish this, so that your eagerness in desiring it may be equaled by your completion of it, according to your ability.

We are not overstepping the limits of our province, as if we did not [legitimately] reach to you, for we were the [very] first to come even as far as you with the good news of Christ.