Since we all have broken God's law in some way by lying, stealing, coveting, hating etc. We all deserve punishment. God knew that we would never be able to live up to this standard and this is why God planned from before creation that there would be a Saviour for mankind! This is because of how great His love is for us!
God loves us so much that He does not want any of us to recieve the justice we deserve, He does want anyone to be punished and separated from Him for eternity. Therefore, in order to reconcile us back to Himself, only He who is without any sin - could come to earth and pay the penalty for our sins.
'For God so loved the world that He gave His one and only Son, that whoever believes in Him shall not perish but have everlasting life' - John 3:16
Jesus Christ, our only hope and Saviour came into this world from Heaven. He left His glory with the Father to become a man like us, being born of a virgin and lived a life without ever sinning once. He was tempted in every way, yet never sinned. Jesus went around healing all who came to Him, He showed us what the Father is like - full of compassion, mercy and grace.
When John the Baptist (who prepared the way for Jesus coming) saw Him, he cried "Behold! The Lamb of God who takes away the sin of the world!" Jesus was the Lamb of God who came to be crucified for our sins once and for all! He has fully paid our penalty, it is finished! When Jesus cried, "It is finished!" The veil of the temple was torn in two, representing that the way back to the Father had been restored! And to prove His victory over death, Jesus rose again on the third day from the dead, just as He prophesied many times! The grave could not hold Him because He was without sin!
As Jesus has paid the price, we can now be washed and cleansed and be made right again with God. This is called being 'made righteous.' We could never do enough good works to earn this. God makes us accepted in the beloved, as Jesus has taken all our shame, all our guilt and all our sins upon Himself! This is the good news of the Gospel and He did it just for you and I!