Thank you for your post. As Dr. Michael Brown would say, "We fail to meet the expectation God has for us even on our best day."
I know I am sinful simply by reflection. I cannot keep myself from sinning though I know I should not sin. Paul talks about his own sin in Romans 7, that he does what he does not want to do and doesn't do what he wants to do. This does not answer why we sin though. I have a conflict here... Christ calls His elect, in fact, if Abraham did not exist then neither would Yashua, son of David. We know God has a plan and He keeps to that plan. Yet we sin. How divinely does God work then to bring about his plan even in our sin?
חָטָא chata: to miss, sin
תּוֹרָה torah: direction, instruction, law
The Western mindset is built on Greek philosophy, which is abstract.
In contrast, the Hebraic mindset is concrete. In other words they think in terms of what can be perceived through the senses.
So from a Hebrew perspective the torah, or law, might be thought of as a direction, as toward a target; whereas sinning might be considered as straying from that direction.
Thinking as a Hebrew helps to take away the confusion that can be caused from Greek philosophy
I find it interesting that Yahshua called himself the way דֶּרֶךְ derek.
The Hebrew word for repent is teshubah. The root of that word is שוב shub. It means to return.
The first place we see that root, is in Genesis 3:19
(CLV) Gn 3:19
By the sweat of your brow shall you eat your bread, Until you return to the ground, for from it were you taken. For soil you are, and to soil you shall return.
(CLV) Ec 12:7
And the soil returns onto the earth just as it was, And the spirit, it returns to the One, Elohim, Who gave it.
When YHWH created man, he said that it was good. Man, אדם, turned away from YHWH.
YHWH is the target, if we are walking on the path, or in the way, we are returning to YHWH. If we sin, stray from the path; we will miss the mark. We have lost our direction. We must follow the light to return to the path.
That which we put between us and the way to the Father, is what separates us from the Father.