Well some people here react as if theres something wrong with using your own mind, I see absolutely nothing wrong with it. Can my mind be wrong, now come on, of course it can. But I would rather deceive myself, than to allow someonelses mind to deceive me. In fact, I asked God to give me a sound mind years ago, and I asked him to unhook me from the need to look outside of myself for the truth. He answered that prayer.
I don't like depending on sources outside of myself for truth. Truth is hard to determine , but once you think you need books, people, literture, archives, and all that, your addicted to looking outside of yourself for truth, and that further comlplicates matters, what if the sources are in error? Now there are situations that you must look outside of yourself. Such as recently, I never really knew how long ago Adam was created, I still don't know. I have to look outside of myself, because my mind does not know. I will know, but just not now, so I research, because God has not downloaded that information into me.
But I know somewhat how it is when he does download things, and I have learned to trust that.
Peace.