Temptation

The Serpent glad in what Adam and Eve had done, began to rejoice along with the fallen angels cast out of heaven and onto the earth.

God says to the Serpent...

Because thou hast done this, thou art cursed above all cattle, and above every beast of the field; upon thy belly shalt thou go, and dust shalt thou eat all the days of thy life.

(Genesis 3:14 KJV)

However despite God being angry, God also showed his love as he fully clothed Adam and Eve, making coats out of animal skins. And God says...

Behold, the man is become as one of us, to know good and evil: and now lest he put forth his hand, and take also of the tree of life, and eat, and live forever:

Therefore the Lord God sent him forth from the garden of Eden, to till the ground whence he was taken.

So he drove out of man; and he placed at the east of the garden the Cheru-bims and a flaming sword which turned every way, to keep the way of the tree of life.

(Genesis 3:22-24 KJV)

Wow this is eye opening stuff to keep the tree of life both good and evil. But one can see after Adam and Eve were thrown out of the garden of Eden they began to produce children, and their children's children began to produce and so on.

They were not thinking of good things, filling their hearts with a good heart that was faithful to God. Man allowed their hearts to be tempted with evil, and an evil heart is that of the Serpent, Satan, Lucifer, in other words a follower of the Devil.