Being inspired by God means that it comes from Him and not from our own vain imaginations.
Okay, but that doesn't have to mean that the words are being verbally dictated to you. Too, you could be inspired to create things that don't even contain words, like music or paintings.
Now, lets say that you do have the words verbally dictated to you, i.e. you're hearing voices. How do you know that it is coming from Him rather than your own vain imagination?
Isn't it pretty vain to think that God is talking directly to you?
Further, if someone writes something and says that God verbally dictated it to them, then how do you know that it came from Him rather than their own vain imagination?