For Christians struggling with assurance of salvation, consider:
True Christian righteousness is the righteousness of Christ who lives in us. We must look away from our own person. Christ and my conscience must become one, so that I can see nothing else but Christ crucified and raised from the dead for me. If I keep on looking at myself, I am gone. If we lose sight of Christ and begin to consider our past, we simply go to pieces. We must turn our eyes to the brazen serpent—Christ crucified—and believe with all our heart that He is our righteousness and our life. - Martin Luther, Commentary on Galatians