It is our own thoughts that make us do bad things. When we want to do something wrong, our thoughts lead us in a bad way. We may agree to do what our bad thoughts tell us to do. When we do that, it becomes a sin. Then, we may not stop doing those bad things. If we continue to live like that, the result of our sins is death. James 1:14-15
但各人被試探，乃是被自己的私慾牽引誘惑的。 私慾既懷了胎，就生出罪來；罪既長成，就生出死來。 雅各書 1:14-15