Jesus said, "Don't let your heart be troubled. Believe in God. Believe also in me. In my Father's house are many mansions. If it weren't so, I would have told you. I am going to prepare a place for you. If I go and prepare a place for you, I will come again, and will receive you to myself; that where I am, you may be there also. Where I go, you know, and you know the way."

Thomas says to him, "Lord, we don't know where you are going. How can we know the way?"

Jesus said to him, "I am the way, the truth, and the life. No one comes to the Father, except through me."

John 14:1-6

See also: What If You Actually Believed You're Going to Heaven?