At that moment, three Gentiles came to the house looking for Peter. The purpose of the vision was to let Peter know that he was to accept the three "unclean" Gentiles, who had been sent to him by God (Acts 10:20). The Gospel was to be preached to the entire world and wasn't just for Jews.
But there is also another meaning of the vision. If God has cleansed you with His blood, you must not consider yourself unholy. The blood of Jesus cleanses us from all unrighteousness, not just some. God has imputed His righteousness to you, so that you are completely clean in His eyes!
Did you do something bad in the past that's still bothering you? If you have received Christ into your life, He has cleansed you. That means you must no longer consider yourself unholy. If God forgives you, you must forgive yourself. Don't just take my word for it. Take it from God. He said it, not me.
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