For God to utilize His People in different ways is not partiality. To use me in a different manner than He uses you is showing no partiality to either one of us. He uses each of us to further His Plan. Each of us have different functions, different gifts, and different paths to follow, as He Wills. There is no pariaility in that.
An acusation of partiality in such things is actually the sin of jealousy on the part of the person accusing God of such, even hypothetically. And to make such an accusation against a Believer with whom you disagree doctrinally as a means of maligning his doctrine is being less than truthful. It is a false accusation, because as a Christian, you CAN'T believe such a thing of God and yet love Him. Therefore, you accuse another falsely of something that is within your own heart, and you are actually in a veiled way questioning his salvation.
Who are you that judges another's servant? To his own master he stands or falls. But he will stand, for God is able to make him stand. (Rom 14:4)
*sigh* What is with certain people that they can't manage to disagree with someone on the least issue without accusations of sin and heresy? Thank you, Harley, for not stooping to that, though I don't see that we're really disagreeing on anything.
All I said is that God does not issue out gifts and callings equally to all. "To whom much is given, much is expected" (Lk. 12:48) is meaningless if all are given equally. For that matter, you'll notice that not all received equal amounts in the parable of the talents.
Insofar as Harley has defined partiality, I don't have a disagreement with him. However, I would point out that the context of all the passages you cited was that God does not show partiality in regards to His condemnation of sin and His requirement for redemption--that is, the Jew does not get a special dispensation in that respect to the Gentile. That does not mean that He gifts and blesses all men exactly alike.