God has now revealed to us His mysterious plan regarding Christ. Ephesians 1.9

  Even before He made the world,  God loved us and chose us in Christ to be holy and without fault in His eyes.  God decided in advance to adopt us into His own family by bringing us to Himself through Jesus Christ.  This is what He wanted to do,  and it gave Him great pleasure.  He is so rich in kindness and grace that he purchased our freedom with the blood of His Son and forgave our sins.  He has showered His kindness on us,  along with all wisdom and understanding.  Ephesians 1.3-8
  In the Old Testament,  Christ was still a mystery.  One would believe God by faith and sacrifices were offered for sin.  Then Jesus came.  He is the sacrifice for our sins.  He is no longer a mystery.  He is King of Kings and Lord of Lords and is totally accessible to us every moment of every day.  We don't even have to phone Him (LOL) , we just call on His name. Thats unconditional love. Thank you Jesus!