I don't teach it anymore, but I used to teach the very first class of the nursing program. I would tell them that they were standing in a dark room holding a match. In a few days they would start to understand a few things, but it would be like trying to see the corners of the ceiling by match light. Each class they would get a progressively bigger light, candle-light, flashlight, ect. I told them at no point would they ever be in a room where the light showed everything, because no one can know everything. So, at times when you feel lost and like you are in the dark, maybe what you are trying to learn is just a match light. You just don't have it yet, but you will. And that if you feel like someone else is standing in a room full of light (and understanding) that there are dark rooms to them that you see without difficulty. Try your best. Because no one can know what they haven't been taught. Study. But don't beat yourself up because you SHOULD know it but don't. Look for other ways to see the problem. Look for other ways to seek the answers.