'Within' in the Bible

Ridding yourselves, therefore, of all that is vile and of the evil influences which prevail around you, welcome in a humble spirit the Message implanted within you, which is able to save your souls.

And the tongue is a fire. That world of iniquity, the tongue, is placed within us spotting and soiling our whole nature, and setting the whole round of our lives on fire, being itself set on fire by Gehenna.

What causes wars and contentions among you? Is it not the cravings which are ever at war within you for various pleasures?