Book of John

“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 3:16

Here are some verses about Heaven:
http://www.whatchristianswanttoknow.com/bible-verses-about-heaven-15-scripture-quotes/ 

Yes, it is by God’s Grace and our Faith that we go to heaven. God wants every person to believe the gospel and have eternal life. Some of the themes in the book of John is the concept of redemption, judgement, and repenting:

redemption
http://www.whatchristianswanttoknow.com/search/?query=Redemption
judgment
http://www.whatchristianswanttoknow.com/search/?query=Judgment
repent
http://www.whatchristianswanttoknow.com/search/?query=repent

When it comes to eternal life with God, or Salvation by being born again (spiritually) the Book of John is a good place to seek. A good portion of the book is quoting Jesus:
Here are the 21 Chapters of the Book of John – Click Here:  1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21