1 John 4:1 amp

Beloved, do not put faith in every spirit, but prove (test) the spirit to discover whether they proceed from God; for many false prophets have gone forth in the world.

We are entering a time when having strong bible knowledge will be our most significant aid.  Many voices are vying for our attention to influence our belief system or get rid of it completely.  By knowing God’s word, we will be less likely to be deceived by a false prophet.  If what they say doesn’t line up with the word, their word has failed the God test.