How do we know that God saves us according to His purpose?

Paul emphasizes in 2 Timothy 1:9 that we have been saved and called not according to our works, but according to God’s purpose and grace given to us in Christ Jesus before the world began. This reflects the doctrine of sovereign grace, which posits that God's election and calling are rooted in His divine purpose, not reliant upon human effort or merit. The assurance comes from understanding that our salvation is secure because it originates from God’s unchanging will and intent, demonstrating His sovereignty over all aspects of redemption. This biblical foundation reassures believers that their salvation is not contingent on their performance but is anchored in God’s eternal grace.