But no unregenerated sinner was humble in eternity when God determined to graciously save them by grace in time and space. Humble at the "point" of salvation doesn't mean diddly squat because the sanctifying grace of God could well have preceded one's actual new birth for years!
In fact, I just read a fascinating testimony in a news story about a woman who had been steeped in occult practices for many years, and who had been struggling with God, turned to Jesus for a short time, then left then finally returned for good. Clearly God had been gracious working in this woman's life for some time -- even though she wasn't humble at all.
I know you probably hat the fact that one's humility that's prerequisite for receiving grace is totally bound up in the Humble Servant of God who took on flesh so that he could save mankind. God, too, worked actively in my life for at least 2 years before I was saved. But his grace was not based on any inherent humility in me. The only time true humility entered my mind, heart and soul was at the point of my new birth.
Making someone humble is God's job.
Knowing who is really being humble is His discernment.