elijah23 said:
“Repentance†means to “stop sinning.†Therefore, I think it’s worth our while to figure out just exactly what sin is so we can repent of it.
Any ideas?
First, we obviously need to define "repent" first! (Not just because I think your definition is wrong, but because others have other ideas also.)
As someone said, the Biblical def. of "repent" is to "Change one's mind so that one can change one's actions"
To repent, in Biblical (NT) terms, is to accept Jesus Christ as Lord and Savior and accept that He died on the cross to fulfill God's Law and to carry our sin so that we may be drawn close to the Lord. If you repent you can only repent once, because once you have accepted Jesus, and I mean REALLY accepted Him and His gift to man, you will never turn from Jesus.
To be a Christian means to have repented, to be born anew, to be a creature of Heaven and not of the world.
As Heavenly creatures we must abstain from sin, and this is where the definition of sin comes into play (meaning I can finally answer the OP's question!).
Sin means to be "off the mark" in Greek.
To sin is to break God's Laws: "Everyone who practices sin also practices lawlessness; and asin is lawlessness." - 1 John 3:4
To sin is to rebel against God: "Remember, do not forget how you provoked the Lord your God to wrath in the wilderness; afrom the day that you left the land of Egypt until you arrived at this place, you have been rebellious against the Lord." Deuteronomy 9:7
Sin originated with Lucifer, it was passed from Satan to Adam, and Adam, being the first man, passed it onto all of mankind.
We can look at murder and say it is a sin because a man killed another man, this is not the reason murder is sin though. God loves every single person, for He is the Father of all. When we murder another man we murder one of God's loved ones, and for this reason, murder is a sin. The same can be applied to stealing/raping/ect.. In fact, you can apply this to real life. If someone steals from your child, you take this personally, however if the news is reporting about a robbery it is not personal because that man is not you child.