Two notes on the following text. First, the text was written by the Swiss reformer Huldrych Zwingli. Zwingli often gets lost between Luther and Calvin, although he shouldn’t be so easily displaced. He was a remarkable thinker, gifted leader, and incredibly gracious in his dealings with a hostile Luther. Second, and more importantly, this text deals with the common problem of Christians and continuing, even daily sin. Pay attention to where Zwingli places confidence. Is it in performance or Christ? Pay attention to what Zwingli believes is a sign that God has entered into a person’s life, and to go further see if you can identify why he believes this.
“As long as we live, that rogue, the body, because of the temptation, will never let us live a godly life. However, if we have trusted in God through Christ, then the flesh cannot throw us into damnation. Rather, as Christ said to Peter: ‘See! The devil has lain in waiting for you so that he may sift you as wheat. But I have prayed for you, Peter, that your faith become neither unsteady nor weak” (Luke 22.31f). Thus we must remain firm so that all our sins will be forgiven through Christ, although both the devil and the flesh will force us through the sieve and entice us with sin to despair. But, as Peter’s external denial di dnot bring him into damnation, so also may no sin bring us to damnation, save one: unbelief. Here, however, the true non-Christians say: “I firmly believe in Christ.” Yet they do nothing Christian. Herein one sees that they are non-Christians, for one recognizes a tree by its fruit. Therefore, note for better understanding: as has often been pointed out before, whoever has securely trusted in teh grace of God through Christ, after recognizing his sin, cannot be without the love of God. Who would not love him who has so graciously taken away his sin and has begun first to love him, as 1 John 4.19 says, and to draw him to himself? Where, now, the love of God is, there is God; for God is love himself and whoever is in the love of God is in God and God is in him, as 1 John 4.16 says. Now if God is in the right believer and he nevertheless sins, then it follows that it is as Paul says in Romans 8.10: “If now Christ is in you, then the body is dead because of sin, but the spirit or soul lives because of justification.” This justification is nothing but a person’s placing himself in and devoting himself to the grace of God. This is true belief. So the opinion of Paul is that our body is always dead and gives birth to works of death and sin. However, the same sins cannot damn us if we are righteous in faith, so that we trust with certainty the grace of God through the Lord Jesus Christ.”
Huldrych Zwingli, A Short Christian Instruction Zwingli’s Works vol II pg 58-59