Do not call anything impure that God has made clean

Acts 10:1-16
Cornelius was told, Your prayers and gifts to the poor have come up as a memorial offering before God. Now send men to Joppa to bring back a man named Simon who is called Peter. He is staying with Simon the tanner, whose house is by the sea.
About noon the following day as they were on their journey and approaching the city, Peter went up on the roof to pray. 
He saw heaven opened and something like a large sheet being let down to earth by its four corners. It contained all kinds of four-footed animals, as well as reptiles and birds.Then a voice told him, “Get up, Peter. Kill and eat.”
The voice spoke to him a second time, “Do not call anything impure that God has made clean.” This happened three times, and immediately the sheet was taken back to heaven.
Up to this point the gospel has been preached only to Jews. converts to Judaism and Samaritans. Now God steps in to make it plain that the message is for everyone. God prepares the Roman officer, Cornelius, and he prepares Peter. Three times the vision and message come - apparently instructing Peter to break the Jewish food laws.
Why?
God's plan is step to step preach gospel to everyone. God's love is face to everyone on the world.
Cornelius, a Roman officer, who is fear the Lord and his prayers and gifts to the poor have come up as a memorial offering before the Lord, it is the best offering to the Lord.
God told Peter three times ,"Do not call anything impure that God has made clean." The clean and unclean is defined by the Lord instead of man.
Do not limit everything to the law for God's love is beyond all.
How?
Love cover every evil and ugly things, only love may turn heart of man to the Lord.