Mark 7:16 Meaning

14And when he had called all the people unto him, he said unto them, Hearken unto me every one of you, and understand:

15There is nothing from without a man, that entering into him can defile him: but the things which come out of him, those are they that defile the man.

16If any man have ears to hear, let him hear.

17And when he was entered into the house from the people, his disciples asked him concerning the parable.

18And he saith unto them, Are ye so without understanding also? Do ye not perceive, that whatsoever thing from without entereth into the man, it cannot defile him;