Sin makes people unhappy, and God hates it because He loves everybody. Happiness can be found only in obedience, or doing right.
Before sin reached Eden, Adam and Eve knew nothing of evil. So their only test was in regard to one special tree planted in the garden. It was called the "tree of knowledge of good and evil."
God said of the fruit of this tree, "Ye shall not eat of it, neither shall ye touch it, lest ye die." Genesis 3:3. If they kept away from this tree they would never know evil. At that tree was the only place where Satan could meet them to tempt them.
One day the curiosity of Eve led her to come near the forbidden tree. By so doing she placed herself where Satan could tempt her, and he was there to meet her as he always meets us when we go in the way of temptation.
Satan did not come in his own form, but in the shape of a beautiful Serpent. Eve would have known him in his real person, for angels had told the first pair about the rebellion of Satan and his angels. Satan never comes to us as he really is. He comes as a deceiver, just as he came to Eve in the garden.
The serpent told Eve that the forbidden fruit was good, and began to eat some of it. Probably he told her that it gave him power to talk. Eve looked at it and thought about it. The more she looked at it the more she wanted some of it.
But she told the serpent that the Lord had forbidden them to eat of it, for if they did they should "surely die."
Angels sent to tell the first pair about the rebellion of Satan and his angel.
But the serpent said, "Ye shall not surely die." "See, I am eating of it and it does me no harm. In fact, I feel better all the time I am eating of this fruit."