How do we know we are made righteous?

According to Romans 4:3, Abraham believed God, and it was counted to him as righteousness. This imputation of Christ's righteousness is a fundamental doctrine in Reformed theology. When a believer places their trust in Christ, they are effectively clothed in His righteousness, as illustrated by the parable of the prodigal son, where the best robe symbolizes the righteousness granted to believers. This transaction signifies that our justification is a divine work, completely apart from human effort, reaffirming the principle of sola fide, or faith alone.