How do we know that God's elect are called to salvation?

The doctrine of election and the effectual call is foundational in Reformed theology. As seen in Philippians 3:12, Paul highlights the truth that believers are 'apprehended' by Christ, meaning that their call to salvation is initiated by Him rather than by their own efforts. This effectual call signifies that God's love and mercy reach down to individuals, transforming their hearts and enabling them to respond in faith. It's not a mere invitation but a sovereign act of God that ensures salvation for His chosen ones, as articulated in Ephesians 1:4-5, where Paul indicates that those whom God chose are also destined to be His children. The certainty of this call is rooted in God's unchanging purpose and grace.