Catholics can be sure as anyone else that they are in God's good graces. The apostle John states that "you may know that you have eternal life" (1 Jn 5:13 - see also Jn 5:24). But this "assurance" has to be understood in light of John's other teachings in the same book: "For this is the love of God, that we keep his commandments" (1 Jn 5:3 - see also 1 Jn 2:3-6). "We know that anyone born of God does not sin" (1 Jn 5:18). "He who loves God should love his brother also" (1 Jn 4:21). "He who commits sin is of the devil" (1 Jn 5:18 - see also 1 Cor 6:9). Likewise, St. Paul does not regard salvation as a one-time event, but as a goal to be sought after, one that can be lost: "Work out your own salvation with fear and trembling" (Phil 2:12 - see also 1 Cor 9:27, 10:12; Gal 5:1, 4; Phil 3:11-14; 1 Tim 4:1, 5:15).