It's a matter of FAITH.

F  is for FORGIVENESS
    We cannot have eternal life and heaven without God's forgiveness.
  "In him we have redemption through his blood, the forgiveness of sins, in accordance with the riches of God's grace."
Ephesians 1:7(NASB)

A is for AVAILABLE
    Forgiveness is available.  It is -

Available for All.
  "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(NASB)

But Not Automatic.
   "Not everyone who says to Me, 'Lord, Lord,' will enter the kingdom of heaven, but he who does the will of My Father who is in heaven will enter." Matthew 7:21(NASB)

I is for IMPOSSIBLE
    It is impossible for God to allow sin into heaven
because of who He is:
 
God is loving and just.  His judgment is against sin.  
      "Christ redeemed us from the curse of the Law, having become a curse for us - for it is written, 'Cursed is everyone who hangs on a tree.'"  Galatians 3:13   

      "For judgment will be merciless to one who has shown no mercy; mercy triumphs over judgment." James 2:13 (NASB)

Because of who we are:  Every person is a sinner. 
      "For all have sinned and fall short of the glory of God." Romans 3:23 (NASB)
    But how can a sinful person enter heaven, when God allows no sin?


T is for TURN
    Turn means repent
Turn from sin and self and Turn to God.
          "I tell you, no, but unless you repent, you will all likewise perish."
Luke 13:3 (NASB)

Turn and trust Christ only. 
       "That if you confess with your mouth Jesus as Lord, and believe in your heart that God raised Him from the dead, you will be saved" Romans 10:9 (NASB)

H is for HEAVEN

    Heaven is eternal life.

Here on earth: 
                "The thief comes only to steal and kill and destroy; I came that they may have life, and have it abundantly." John 10:10 (NASB)

Hereafter:
         "If I go and prepare a place for you, I will come again and receive you to Myself, that where I am, there you may be also" John 14:3 (NASB)

          "For our citizenship is in heaven, from which also we eagerly wait for a Savior, the Lord Jesus Christ; who will transform the body of our humble state into conformity with the body of His glory... Philippians 3:20-21a