Where is the line?
As Christians in a broken world, many would say it is completely impossible to be in the world and not of it. And besides, what difference does it make that we try to avoid submerging in sin if we are knee deep in it anyway? Some book makes a mockery of my worldview, but it doesn't change it. Why shouldn't I read it? Some movie is completely inappropriate, but I know what is right and what is wrong, so why shouldn't I watch it? When it seems that no one else in the world cares about holiness, where else can you turn? And why does it matter?
When Jesus first called his disciples, he didn't immediately demand perfection. His first call was for proximity. "Come follow me," he said. It was that simple. Naturally, as we follow Jesus, we should become more like him. But even at the cross, Jesus's message was not that we should be perfect and therefore we might be accepted. The message of the cross is that we are accepted, and therefore we can be perfect. If acceptance required perfection of our own accord, there would be no need for the cross. Jesus willingly went to the cross because we cannot be perfect on our own, and he went knowing even before taking on all of our sin that we would sin anyway, and that the world will not be completely sin-free until he returns for the formation of the new heaven and new earth
In this world we are not free of sin. That has been established through scripture, through common sense, and through day-to-day struggles with sin. We are not free of sin, but in Christ we are free from it. That is a purpose of the death and resurrection of Jesus, and it is the hope we have in him. From the moment Christ said, "It is finished," we have been free from both the power and the penalty of sin. The only thing we are not free from is the presence of sin. This explains the phrase made famous by Martin Luther, Simil iustus et peccator, which, simply put in English, means that we can be simultaneously righteous and sinners. In Christ, we have been made righteous, but we still live in a world full of sin.
So what's the point? If we can't be perfect, why should we try? That's where the fault is. We are free from the power of sin because of Jesus, and he can tell us to go therefore and sin no more. Jesus's first call is for proximity, but he doesn't call us to him so we can live a life of sin. He calls us to him so we can learn from him and truly live out our calling on the earth.
The best example there is for how this ties in to the line is alcohol, of all things. Many people drink without getting drunk. There is nothing wrong with that. But how do they do it? There are only two ways. The either stay far away from their limit, or they know their limit because they have exceeded it before. In the same way, how far can we go with sin before we have gone too far? The only way to find out is to go too far. It is simply wiser to avoid the risk entirely.
Regardless of what you are struggling with, it is important to know that Jesus lived the perfect life we were incapable of living and died the death we deserved. Your sins have been paid for. Don't take that news as an excuse to run from Jesus. The first call, after all, is proximity. To deny yourself, take up your cross, and follow Jesus. Not because you have not sinned, but because you have been drawn near, you may go therefore and sin no more.
"And he said to all, 'If anyone would come after me, let him deny himself and take up his cross daily and follow me.'" --Luke 9:23
