One of the key passages in building my theology of sin is Romans 14 – the idea that different actions will be sinful in different contexts depending on the people around you (ie if you cause your brother to stumble by exercising your freedom).
Here’s a little prooftext that fits in nicely with my “everything is sin” framework. Romans 14:23b in particular.
22So whatever you believe about these things keep between yourself and God. Blessed is the man who does not condemn himself by what he approves. 23But the man who has doubts is condemned if he eats, because his eating is not from faith; and everything that does not come from faith is sin.
Here’s one that doesn’t fit so nicely…
4Everyone who sins breaks the law; in fact, sin is lawlessness. 5But you know that he appeared so that he might take away our sins. And in him is no sin. 6No one who lives in him keeps on sinning. No one who continues to sin has either seen him or known him.
7Dear children, do not let anyone lead you astray. He who does what is right is righteous, just as he is righteous. 8He who does what is sinful is of the devil, because the devil has been sinning from the beginning. The reason the Son of God appeared was to destroy the devil’s work. 9No one who is born of God will continue to sin, because God’s seed remains in him; he cannot go on sinning, because he has been born of God. 10This is how we know who the children of God are and who the children of the devil are: Anyone who does not do what is right is not a child of God; nor is anyone who does not love his brother.
And another passage that helps frame my approach to righteousness…
26If we deliberately keep on sinning after we have received the knowledge of the truth, no sacrifice for sins is left, 27but only a fearful expectation of judgment and of raging fire that will consume the enemies of God. 28Anyone who rejected the law of Moses died without mercy on the testimony of two or three witnesses. 29How much more severely do you think a man deserves to be punished who has trampled the Son of God under foot, who has treated as an unholy thing the blood of the covenant that sanctified him, and who has insulted the Spirit of grace? 30For we know him who said, “It is mine to avenge; I will repay,” and again, “The Lord will judge his people.” 31It is a dreadful thing to fall into the hands of the living God.
Then a couple more passages from Romans. Chapter 2…
“12All who sin apart from the law will also perish apart from the law, and all who sin under the law will be judged by the law. 13For it is not those who hear the law who are righteous in God’s sight, but it is those who obey the law who will be declared righteous. 14(Indeed, when Gentiles, who do not have the law, do by nature things required by the law, they are a law for themselves, even though they do not have the law, 15since they show that the requirements of the law are written on their hearts, their consciences also bearing witness, and their thoughts now accusing, now even defending them.) 16This will take place on the day when God will judge men’s secrets through Jesus Christ, as my gospel declares.”
And Chapter 7… which again is pretty important to my model…
13Did that which is good, then, bring death to me? By no means! It was sin, producing death in me through what is good, in order that sin might be shown to be sin, and through the commandment might become sinful beyond measure. 14For we know that the law is spiritual, but I am of the flesh, sold under sin. 15For I do not understand my own actions. For I do not do what I want, but I do the very thing I hate. 16Now if I do what I do not want, I agree with the law, that it is good. 17So now it is no longer I who do it, but sin that dwells within me. 18For I know that nothing good dwells in me, that is, in my flesh. For I have the desire to do what is right, but not the ability to carry it out. 19 For I do not do the good I want, but the evil I do not want is what I keep on doing. 20Now if I do what I do not want, it is no longer I who do it, but sin that dwells within me.
21So I find it to be a law that when I want to do right, evil lies close at hand. 22For I delight in the law of God, in my inner being, 23but I see in my members another law waging war against the law of my mind and making me captive to the law of sin that dwells in my members. 24Wretched man that I am! Who will deliver me from this body of death? 25Thanks be to God through Jesus Christ our Lord! So then, I myself serve the law of God with my mind, but with my flesh I serve the law of sin.