Intuition
I have always been interested in the things we cannot see, hear, feel, smell or taste. The things that are out of reach of our limited senses. I have always felt that there is a sense or a number of senses that aren't obvious to us as humans.
Think of it like this, if humans had no sense of smell we would not think smells existed. If only one person has a sense of smell we would not understand what it was. No matter how much they tried to explain it to us we could not really understand because we don't really have anything to compare it to. We wouldn't be convinced that they could smell because it would seem far fetched. The world could be full of smells but we would not know it because we could not smell them.
If people have a sense of instinct they may not really believe it to be real. When they have their own experience of instinct they become more convinced. If they could learn to draw on their sense of instinct at any time then they could truly believe they have this sense.
In modern society we have been fed a lot of information over the years. We are ridiculed for our beliefs and find it's easier to go along with the status quo then rock the boat. Many people have experienced moments of clarity, so they may have some belief but because there is so much information being thrown at them, they tend to rely on the five senses that they know and trust.
Perhaps all this noise has made us lose our sense of intuition. Maybe the only way to tap into this sense is to be quiet. Even religions bombard us with a lot of information but don't really teach us how to pray in a successful way.
This is how I think instinct works for us beginners. Say we look at someone and we get a sense that that person might be gay, married, sick, lying or whatever. This information might be coming to us out of thin air so we don't really know it to be true. We choose to believe their cover story instead of the truth because they tell us they are straight, separated or fine, etc. We trust our ears and eyes.
This is where we go astray, even if we don't really know the truth we should suspend judgement until it is actually revealed to us. We don't usually see what we aren't looking for. If you just let the information be a possibility, we will be open to learning more information. We have been fed B.S. for so long and so often we have lost touch with our instinct.
I always ask (the universe) to reveal the whole truth to me. Then I just forget about it and wait. Often then it will be revealed to my other senses like sight or touch.
Everyone has had this experience. They lose their keys. They frantically look for their keys. They relax, give up and decide to take the spare keys and look later. They grab their sweater and reveal the keys underneath the sweater, or some variation of this. The experience of instinct is similar but on a bigger scale. All information can be revealed to you if you want it.