God is sovereign and exercises His will and providence not only in who, individually, receives His grace, but also in the measure of grace given.
"For through the grace given to me I say to everyone among you not to think more highly of himself than he ought to think; but to think so as to have sound judgment, as God has allotted to each a measure of faith." Rom 12:3
"Only, as the Lord has assigned to each one, as God has called each, in this manner let him walk And so I direct in all the churches." 1Cor 7:17
"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." 2 Cor 10:13
"But to each one of us grace was given according to the measure of Christ's gift." Eph 4:7
Those who believe the Wesleyan, Arminian, and Pelagian errors will not understand the full weight of these verses.