Jesus was wanting the people to understand that the words coming out of their mouths revealed the state of their hearts and the corruption that would render them defiled in the sight of God… not anything they might eat. Later, when Peter asked for this to be explained, Jesus incredulously asked him if he was that dull! Or to put it in modern language, “Don’t you get it Peter??!!” Jesus then explained what He meant fully, (Matthew 15:15-20) but it seemed not to have stuck well in Peter’s mind, for in Acts 10:9-16 we see God using a vision of unclean animals to convince a unwilling Peter that anything unclean God could make clean…and that God’s intentions were to now welcome Gentiles into the community of faith. This all concluded at Cornelius’ home, a God fearing Roman centurion that was desiring to convert to Christianity. That’s where Peter finally “got it” and Cornelius became his first Gentile Believer. Therefore demonstrating God’s overreaching cleansing power by grace alone, through faith alone, in Christ alone. (Ephesians 2:8)