Two classes of people

I heard Mark Dever say recently that the many ways that we classify people (men and women, Republican and Democrat, pro-war and anti-war, etc.) are all tertiary. The Bible lumps people into one of two camps: either being saved or perishing. I saw that especially clearly today reading 2 Corinthians 2:15,

"For we are the aroma of Christ to God among those who are being saved and among those who are perishing . . ."

Either we are being saved by God, or we are perishing. This is the great division of humanity that drives the mission of the church: to spread the good news of Christ in order that through this message the Holy Spirit may depopulate "those who are perishing" and multiply "those who are being saved."