Hermas (16.1.11-16.1.15)

Listen, now, said he, concerning the spirit which is earthly, and empty, and has no power, but is foolish..

In the first place, that man who seems to have a spirit exalts himself and wishes to have the first place, and he is instantly impudent and shameless and talkative, and lives in great luxury and in many other deceits, and accepts

Next, on no account does he come near to an assembly of righteous men, but shuns them. But he cleaves to the double-minded and empty, and prophesies to them in a corner, and deceives them by empty speech about everything according to their lusts, for he is also answering the empty. For an empty vessel which is put with others that are empty is not broken, but they match one another.

But when he comes into a meeting full of righteous men, who have a spirit of the Godhead, and intercession is made by them, that man is made empty, and the earthly spirit flees from him in fear, and that man is made dumb and is altogether broken up, being able to say nothing.

For if you stack wine or oil in a cellar, and put among them an empty jar, and again wish to unstack the cellar, the jar which you put in empty you will find still empty. So also the prophets who are empty, when they come to the spirits of just men, are found out to be such as when they came.