HUMINT: There are limits to what we can know. Humanity should be humbled by this ever present reality. Consider a wall infinite in height and length - nothing can be known about the other side of the wall. Because we cannot know, we will have to imagine what is on the other side. Our brains are endowed with a near limitless ability to imagine the other side but the intangibility of our imaginings come with a viscous symptom, doubt. There are no physical constraints oppressing our imaginations but there are limits to our collective experience. Projecting what we know about this side of the wall to what we believe to be on the other side of the wall, we find ourselves able to develop intricate truths that require faith to exist. The same is true of doubt. Doubt requires faith to propagate as well. Fortunately, some on this side of the wall abandon the exhausting arguments and are instead looking for the doors through which we will all walk one day.