Just inviting some general discussion on the subject, I'm interested in how people think about this.
Definition of sin is important in many discussions. If we have different ideas, we can deeply misunderstand one another. So to me this seems a good discussion.
It's a bit disturbing that we were born with these attitudes, linked inextricably to our earthly nature. There is some vital insight into how this works here:
But now the righteousness of God apart from the law is revealed, being witnessed by the Law and the Prophets, even the righteousness of God, through faith in Jesus Christ, to all and on all who believe. For there is no difference; for all have sinned and fall short of the glory of God. (Rom. 3:21-23)
What is in view here is the righteousness of God, the only standard by which anyone can be saved. Something in us is not only detached from God but opposed to the things of God. It appears to be the first step in approaching God, understanding that we are in fact sinners. It's not so hard to identify certain sins and times when we failed, that's just a question of being honest with yourself. It's that part of sin that wraps around our ego that entices us to even corrupt our best motives that leave me feeling uncertain.
Sounds like a marksman's term, you missed the target. Your enemy is coming for you and you missed, there are consequences for that. It's almost like our attempts to overcome and defend against our earthly nature and the natural tendency to offend God is somehow disrupted. It's almost like we miss on purpose, not really knowing what it is that threw the shot off.
Grace and peace,
Mark
Yes, our nature has been corrupted. We don't generally use the term "original sin" because that tends to carry with it some Catholic teaching that was added to how the early Christians saw the issue.
God created everything good. There was no sin. We had a given nature, as did all of creation, that could have cooperated with God, grown into fullness in Him, and there was no death.
Of course - that's not what our first parents chose with their free will. They chose NOT to obey the commands of God. Through this choice, sin, like a cancer on creation, was born. Death entered as a result. As a result the very creation itself was infected. And because of that, we are born with our very natures infected. We can no longer really simply choose not to sin, but because our nature is infected, it tends to want to do what our selfish desires want, from an early age. These are the basis through which various passions (which are sicknesses of the soul - pride, covetousness, selfishness, etc) grow. And the more they grow, the more subject to them we become.
(And if you view creation as a metaphor or spiritual story, the truths are still the same.)
Not only internal passions, but also temptations by demons, who are wily to know how to both tempt us and feed our passions, drawing us ever further from any desire to do the will of God.
It is by the grace of God, and salvation through Christ alone, that we receive power to battle against this. When we succeed, the grace of God transforms us through this to become more like Christ, and we are strengthened that much more. When we choose to indulge our passions instead, feeding them, we become weaker, and more inclined to sin. It is an ever-shifting dynamic we participate in by either cooperating with the grace of God or choosing to indulge our flesh.
The "heart" matters, but the heart will almost certainly never be fully perfected in life. Even if it were, it remains susceptible to sin, if such a one were to fail. This is not loss of salvation, by the way - unless one chose to reject God (which should be unthinkable by that point). But I have to say it in order to be clear that we do not in any sense "earn" our salvation. We need only cooperate with God and not reject Him, whatever level that happens to be at.
We do need to understand both what the target is, and what throws off our aim when we miss. I'm not saying this is the basis of salvation, but simply that it is important to Orthodox understanding and practice. It has been written about by Christians since the earliest times. The early desert fathers were very prolific in this sense, as have been many of the monastics. You might be interested in those writings on some level, but I would caution that they are often expressed in an extreme, and some of it could easily be misinterpreted without context.