2Tim 1.9 Preexistence of the elect with Christ The salvation of believers, happened (in the foreknowledge of God) ‘before the foundation of the world’ (Cp. Rom 8:29-30; Eph 1:4-11; Titus 1:2) and the gospel message were also predestined (1 Corinthians 2:7, Ephesians 3:11; cp. Matt 25:34; John 17:24; Heb 4:3; 1 Peter 1:20.
Barnes' Notes on 2Tim 1.9 "The thing was so certain in the divine purposes, that it might be said to be already done; compare Romans 4:17....That is, those things which he foretells and promises are so certain, that he may speak of them as already in existence."
Title: Why Preexistence Does Matter!
Synopsis: Why a literal Preexistence view undermines the human Son of God.
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https://www.youtube.com/watch?v=4JYlhZTXDGc