When Jesus said, "whoever believes in Me shall have eternal life", what exactly did He mean?

What does it truly mean to believe, and how does our 21st century concept of faith and belief differ from the 1st century concept of faith and belief? When Jesus called people unto Himself, what are the words that He used, and what was implied by those words? John wrote in his gospel that Jesus performed many... show more What does it truly mean to believe, and how does our 21st century concept of faith and belief differ from the 1st century concept of faith and belief? When Jesus called people unto Himself, what are the words that He used, and what was implied by those words?
John wrote in his gospel that Jesus performed many authenticating signs in order "that you might believe that Jesus is the Christ, the Son of God; and that believing you may have life in His name." So how is believing that Jesus is the Christ, the Son of God supposed to impact our life? What is implied in those titles that would change the course of our lives by simply believing these things about Jesus?
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