Who maketh thee to differ?

One thing that struck me while I was reading volume 2 of Turretin (pace effectual calling) is that in responding to the Romanists and the Socinians, when it came to the why of individual salvation, he kept quoting 1 Cor. 4:  Who maketh thee to differ?  Why am I saved and another isn’t?  The non-Augustinian has to answer, “Because chose.”  But is that the implied answer to Paul’s question?