It is grace, free, sovereign grace, which has made you to differ!
Should any here, supposing themselves to be the children of God, imagine that there is some reason "in them" why they should have been chosen, let them know, that as yet they are in the dark, concerning the first principles of grace, and have not yet learned the gospel.
If ever they had known the gospel, they would, on the other hand, confess that they were less than the least- the offscouring of all things- unworthy, ill-deserving, undeserving, and hell-deserving, and ascribe it all to distinguishing grace, which has made them to differ; and to discriminating love, which has chosen them out from the rest of the world.
Great Christian, you would have been a great sinner if God had not made you to differ! O! you who are valiant for truth, you would have been as valiant for the devil if grace had not laid hold of you!
A seat in heaven shall one day be yours; but a chain in hell would have been yours if grace had not changed you!
(HT: Reformation Theology)