We know we are in Christ when our identity and hope are centered on His work rather than our own (1 Corinthians 1:30).
Being in Christ is not a work of man but a divine work of God's choosing (1 Corinthians 1:26-30). The evidence of being in Christ is that He becomes our entire foundation. Paul illustrates this as he reflects on his past and emphasizes that nothing he had—whether adherence to the law or good deeds—could contribute to his righteousness. A person who is genuinely in Christ will count all human achievements as loss and find all their sufficiency in Him. Therefore, the assurance of being in Christ comes from recognizing that it is through faith in Him that we receive righteousness, wisdom, and redemption.
Scripture References:
1 Corinthians 1:26-30, Philippians 3:7-8, John 14:20, John 10:26-27, Romans 8:16, 1 John 2:5, Ephesians 2:8-9, Romans 5:1-2
Commentary