Unclean animals - Acts 10

Acts 10:15 Again a voice came to him a second time,"what God has cleansed, no longer consider unholy."

Up until now, to eat unclean animals had been unheard of as acceptable.
We tend to put God in our various boxes and question, judge God with our own value system. But God can work outside of our value system, even though at times it can look so wrong.
God told Abraham to kill Isaac. How wrong can that be? God sacrificed His only son Himself. Would a human do that under any moral value?
We can't judge God. We have to say that His ways are higher than our ways and He's not bound by any kind of boxes.