How do we know being in Christ is true?

The certainty of being in Christ is affirmed in Ephesians 2:13, which states, 'But now in Christ Jesus, ye who sometimes were far off are made nigh by the blood of Christ.' This transition from being afar off to being brought near illustrates not only a change in relationship but a profound transformation of identity. By grace through faith, believers become new creations, a work of God, establishing their standing in Christ, who reconciles them to Himself through His sacrificial death. This truth is embraced by all true believers who recognize their prior state of being without Christ.