(John 14:6)"Jesus said to him, I am the way, and the truth, and the life. No one comes to the Father except through me." (ESV)
With the I am statement, Jesus is claiming to be God, referring back to Exodus 3:14. God the Father, God the Son, and God the Holy Spirit are co-equal and co-eternal. Through his death on the cross and resurrection from the dead, Jesus is the way to the Father. He is the only way to heaven, all other ways lead to hell.
Since Jesus is God he is the source of truth. Truth is rooted in the character and law of God. Everything Jesus says is true, including the statement in this verse. Jesus is the life, he gives eternal life to all who believe in him.
Salvation is found in Christ alone. Apart from Christ you do not have the way, you do not have the truth, and you do not have life. By rejecting Jesus you are left with death, falsehood, and no way to heaven.