Book of John: What do you learn about "life" in the first 5 chapters?

Life is a gift from God and one must believe (BE SAVED) to partake of the gift.

John 1:4
In him was life, and that life was the light of men.
John 1:3-5 (in Context) John 1 (Whole Chapter)

John 3:15
that everyone who believes in him may have eternal life.
John 3:14-16 (in Context) John 3 (Whole Chapter)

John 3:16
"For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.
John 3:15-17 (in Context) John 3 (Whole Chapter)

John 3:36
Whoever believes in the Son has eternal life, but whoever rejects the Son will not see life, for God's wrath remains on him."
John 3:35-36 (in Context) John 3 (Whole Chapter)

John 4:14
but whoever drinks the water I give him will never thirst. Indeed, the water I give him will become in him a spring of water welling up to eternal life."
John 4:13-15 (in Context) John 4 (Whole Chapter)

John 4:36
Even now the reaper draws his wages, even now he harvests the crop for eternal life, so that the sower and the reaper may be glad together.
John 4:35-37 (in Context) John 4 (Whole Chapter)

John 5:16
[ Life Through the Son ] So, because Jesus was doing these things on the Sabbath, the Jews persecuted him.
John 5:15-17 (in Context) John 5 (Whole Chapter)

John 5:21
For just as the Father raises the dead and gives them life, even so the Son gives life to whom he is pleased to give it.
John 5:20-22 (in Context) John 5 (Whole Chapter)

John 5:24
"I tell you the truth, whoever hears my word and believes him who sent me has eternal life and will not be condemned; he has crossed over from death to life.
John 5:23-25 (in Context) John 5 (Whole Chapter)

John 5:26
For as the Father has life in himself, so he has granted the Son to have life in himself.
John 5:25-27 (in Context) John 5 (Whole Chapter)

John 5:39
You diligently study the Scriptures because you think that by them you possess eternal life. These are the Scriptures that testify about me,
John 5:38-40 (in Context) John 5 (Whole Chapter)

John 5:40
yet you refuse to come to me to have life.
John 5:39-41 (in Context) John 5 (Whole Chapter)