The Bible
1 John 5
Saints are born of God through belief in Christ—Water, blood, and the Spirit testify of Christ—Belief in Christ is required in order to gain eternal life.
2By this we know that we love the children of God, when we love God, and keep his commandments.
3For this is the love of God, that we keep his commandments: and his commandments are not grievous.
5Who is he that overcometh the world, but he that believeth that Jesus is the Son of God?
11And this is the record, that God hath given to us eternal life, and this life is in his Son.
12He that hath the Son hath life; and he that hath not the Son of God hath not life.
17All unrighteousness is sin: and there is a sin not unto death.
19And we know that we are of God, and the whole world lieth in wickedness.