Abundant Life is the offer made to humans who will obey the Law of Yahweh. His Son Jesus Christ said I am come that they might have life and that they might have it more abundantly. Most don't want it. Our dying and disobedient nature entered the world because Adam Sinned. Just like all the rest of the animals, we must die and turn back into the very dirt we are made out of. That is the punishment for sin - in Hebrew it is called MOT, and we call it MORTality. In this life of mortality, we have a chance at immortality, or an UNdying nature, by learning, believing and obeying the Word God gave us - in the Bible.
Because the first man, Adam, directly and knowingly disobeyed the command not to eat from the Tree, death entered the world. Jesus Christ died on a tree, nailing to it the sinful nature that resulted from Adam's sin. The way to the tree of life therefore became opened once more. To obtain the reward of immortality, every person must believe in the death of Jesus on that tree. (Some call it a cross).