How do you know when god is speaking to you?
He ain't. If he was, wouldn't be no question.
Got a problem with a prophet?
Stone 'em. If you're the forgiving sort, you can always ask if he is insane. Any prophet claiming sanity is at odds both with the historical record and scripture (assuming, of course, one reads between the lines.) If you're a believer, be warned by 2 Thessalonians - real prophets can be either true or false, and still be entitled by god. Yet, in this day and age, anybody can claim anything. History Channel told me Christ has returned in three different incarnations - supposedly even interviewed. But I don't watch much TV.
Schizophrenia?
You betcha. Curious, that one percent of the human race suffers from such a thing, regardless of race, color, or creed. It is my hypothesis that one allows for the other, and what causes certain mental illnesses is the processing of simultaniety. Typically, when the mind goes off in three different directions at once; two are discarded. There may be a memory, or the memory of a dream, or a lost moment. The schizophrenic, however, has no innate protection; and each reality is equally real. Since the "learned professionals" subscribe to but a single objective reality, medication is proscribed.
But why would such things matter? I got a piece of "gospel" for ya - god does not do sequential time. Since I take issue with such limited, but meanigless terms such as "almighty," or "omni," it is my contention that god possesses universal simultaniety. Everywhere, at once, and always. Essentially, god does not "communicate" as we know it. Ain't no, subject, verb, direct object; there's visions, the Holy Spirit, a time to speak, and a time to listen. Prophet gets nothing from god in the now. Prophet gets a seed. Seed grows in the fertile field of human interaction, depending on culture, context, the age, and the political climate. "Words of God" originate between the prophet - who knows god, but is "unknowable" due to his insanity - and the priest who is receptive of a consistant theology and can elucidate such in terms the public can understand - or so I hypothesize.
Don't matter. God got something to say, you'll hear it; and you'll hear it at the exact moment that you need to hear it. Ain't no god so big, ain't got time to speak to you. Somebody call himself a title, try to convince you of something, speak in words and concepts you don't understand; that ain't communication. Somebody try to get you to choose other than life, talk about the greater good, or the lesser evil, or sacrifices must be made; let the prophet do the sacrificing. Thing is, with god; everybody wins, yet often those who claim titles look to make someone a loser.