'Spirits' in the Bible

But I will come to you soon, if the Lord is willing, and I will find out not just the talk of these arrogant people, but [evaluate] their [spiritual] power [whether they live up to their own claims].

On the contrary, the things which the Gentiles (pagans) sacrifice, they sacrifice to demons [in effect], and not to God; and I do not want you to become partners with demons [by eating at feasts in pagan temples].

and to another the working of miracles, and to another prophecy [foretelling the future, speaking a new message from God to the people], and to another discernment of spirits [the ability to distinguish sound, godly doctrine from the deceptive doctrine of man-made religions and cults], to another various kinds of [unknown] tongues, and to another interpretation of tongues.

for the spirits of prophets are subject to the prophets [the prophecy is under the speaker’s control, and he can stop speaking];