How do I know if I have a vision?

So far, I don’t remember having a vision, and whatever a vision is, you don’t actually think it on your own, do you? Isn’t it involuntary thinking or something? Is vision something you’re actually seeing and seems very vivid and you don’t actually see what’s actually around you? Isn’t having a vision different than thinking something? Have you had visions before?

How do I know if I have a vision?
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