Here is Ray's answer to your first question. I'll see if I can find anything on Cain.
http://bible-truths.com/lake15.htmlIN THE BEGINNING/IN THE GARDEN
What was the first historically recorded choice of our first parents? We read of Mother Eve that:
"…she took of the fruit thereof, and did eat…" (Gen. 3:6).
But was this the first choice and the first sin attributed to our Mother Eve? No, it wasn’t the first. It was not even the second, or the third choice.
It is generally taught that Adam and Eve were spiritually perfect immediately after their creation, seeing that it says,
"And God saw every thing that He had made, and, behold, it was very good…" (Gen. 1:31).
Never mind the fact that even poisonous snakes were also "very good." Of course everything God made was "good." It was, in fact, even "perfect"—perfect, that is, for the purpose for which it was created.
But did our first parents have perfect and good spiritual character of heart when God completed them? Absolutely not! Far from it! They were as carnal-minded as any two people who have ever lived.
The Scriptures show us that Eve committed every known category of sin there is, before she ever ate of the forbidden fruit. This one should knock your socks off. It knocked mine off when I first discovered it.
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SIN BEGINS IN THE HEART
Man’s mind is not the birthplace of sin. And certainly man’s will is not the originator of sin. God did NOT say: "O that there were such a WILL in them..." (Deut. 5:29). If we will just believe, our Lord tells us plainly where sin originates:
"And Jesus said, Are ye [all of you] also yet without understanding?
Do not ye yet understand, that whatsoever enters in at the mouth goes into the belly, and is cast out into the draught?
But those things which proceed out of the mouth come forth FROM THE HEART; and they defile the man.
For out of THE HEART proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:
These are the things which defile a man: but to eat with unwashed hands defiles not a man" (Matt. 15:16-20).
Need I remind any that all of the above thoughts and deeds are sin?
So what pray tell does all this stuff have to do with Mother Eve’s sin in the garden? A lot—everything. The Apostle John classifies all sins into just three categories under one heading.
LOVE NOT THE WORLD—THREE CATEGORIES OF SIN
"Love NOT the world, neither the things that are in the world. If any man love the world, the love of the Father IS NOT IN HIM. For [for means ‘because’] ALL that is in the world,
the lust of the FLESH,
the lust of the EYES,
and the pride of LIFE,
is not of the Father, but is of the world.
And the world passes away, and the lust thereof: but he that does the will of God abides for ever" (I John 2:15-17).
Notice that "…ALL that is in the world…"—all the sins of the world, have their origin in one of these three categories of sin that proceeds "out of THE HEART." Not out of the "will" or out of the "mind," but "out of THE HEART." The "will" and the "mind" are subject to the "heart," and not the other way around. The heart is not subject to the will, neither is the heart subject to the mind, but rather both of these are subject to the birthplace of all human functions—the HEART!
Simply and unarguably, Jesus states as a fact, that all evil thoughts and sins proceed OUT OF THE HEART.
Now, with all that said, let’s prove once and for all that Mother Eve and Adam were (1) NOT spiritually perfect in any way shape or form, BEFORE they actually ate of the forbidden fruit, and (2) neither did they sin and then partake of the forbidden fruit through the operation of something called "free will."
"And when the woman saw that the tree was GOOD FOR FOOD… Gen. 3:6:
"…lust of the FLESH…" (I John 2:15)
and that it was PLEASANT TO THE EYES… Gen. 3:6:
"…lust of the EYES…" (I John 2:15)
and a tree to be DESIRED TO MAKE ONE WISE Gen. 3:6:
"…the PRIDE OF LIFE" (I John 2;15)
Eve committed EVERY CATEGORY OF SIN THERE IS IN THE WORLD, before… BEFORE she actually ate of the forbidden fruit.
ALL of Eve’s evil thoughts of pride, vanity, lust, greed, disobedience, and finally thievery proceeded NOT from Eve’s supposed "free will," but rather from out of her HEART. And the only reason these sins could come out of her heart is because THEY WERE ALREADY IN THERE FROM THE BEGINNING. BEFORE Eve actually ate of the forbidden fruit, she committed every category of sin in the world. And need I remind us that we were also, ALL IN ADAM, before he ate of the tree (I Cor. 15:22). Will we deny our own eyes and the Scriptures we have just read?