The ordo salutis is the theological doctrine that deals with the logical sequencing of the benefits of redemption as we are united to Christ which are applied to us by the Holy Spirit. The Holy Spirit was given to us after Christ departed the earth.
This first thing to remember is that we must never separate the benefits (regeneration, justification, sanctification) from the Benefactor (Jesus Christ). The entire process (election, redemption, regeneration, etc.) is the work of God in Christ.
Regeneration, the work of the Holy Spirit which brings us into a living union with Christ, has a causal priority over the other aspects of the process of salvation. God opens our eyes, we see. It is this step that you are now, hopefully, experiencing.
God circumcises/ unplugs our ears, we hear his call. Just as Jesus called a dead and buried Lazarus out of the grave, he comes; In the same way, the Holy Spirit applies regeneration, (opening our spiritual eyes and renewing our affections), infallibly resulting in faith.
All the benefits of redemption such as conversion (faith & repentance), justification, sanctification and perseverance presuppose the existence of spiritual life. The work of applying God's grace is a unitary process given to God'speople simultaneously. This is instantaneous, but there is definitely a causal order (regeneration giving rise to all the rest).
Though these benefits cannot be separated, it is helpful to distinguish them. Therefore, instead of imposing a chronological order we should view these as a unitary work of God to bring us into union with Christ. We must always keep in mind that the orders expressed in the following articles occur together or happen simultaneously like heat and fire. All aspects of the work of God continue together throughout the life of a Christian.
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