For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the firstborn among many brothers. And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified.

We should be flexible as to what goes into the ordo and what does not. The Bible itself doesn’t use the phrase ordo salutis… And Scripture does not include anywhere a list of all the events theologians typically include under that label. Myself, I think that the ordo is mainly a pedagogical device. As you go through the various items on the list, there is no consistent principle of ordering. Some items precede other items because the first comes earlier in time, the other later. That is the case with effectual calling and glorification. Other items on the list precede others because one is a cause, the other an effect, as with regeneration and faith. Still others come before others not because of temporal priority or causal priority but because of what theologians call instrumental priority, as in the relation of faith to justification. And still other pairs of events are simply concurrent or simultaneous blessings, like justification and adoption. So the order means different things: sometimes cause and effect, sometimes earlier and later, sometimes instrument and object, sometimes mere concurrence. Nevertheless, the order does bring out important relationships between these events, relationships that the Bible does set forth.

Historically in the Church there has been disagreement about the order of salvation, especially between those in the Reformed and Arminian camps. The following two perspectives of God’s order in carrying out His redemptive work reveals the stark contrast between these two main historic views. Keep in mind that both viewpoints are based on the redemptive work which Christ accomplished for His people in history:

In the Reformed camp, the ordo salutis is 1) election, 2) predestination, 3) gospel call 4) inward call 5) regeneration, 6) conversion (faith & repentance), 7) justification, 8) sanctification, and 9) glorification. (Rom 8:29-30)

In the Arminian camp, the ordo salutis is 1) outward call 2) faith/election, 3) repentance, 4) regeneration, 5) justification, 6) perseverance, 7) glorification.

Notice the crucial difference in the orders of regeneration and faith. While the Reformed position believes spiritual life is a prerequisite for the existence of the other aspects of salvation, the Arminians believe that fallen, natural man retains the moral capacity to receive or reject the gospel of his own power.