If you know something and understand it, you are not interested in looking for it, because you already got it completely. What you don't know, by definition you cannot even imagine and search for it, because it resides in some dimension that is either nonexistent or you don't have any access to it, yet. But when you already know something but you don't remember how, hence you don't understand it, in those situations, you delude yourself by saying "I want to know". No, no, no. Whenever you say you want to know, actually you already know it. When you say I want to know this or that, actually you are just trying to understand it. The "what" is the thing that you already know, but you are trying to find the "why" and "how". 

From your everyday life you can tell that whatever you know about something in your day-to-day events, situations, skills, memory, knowledge about any particular event, you realize that you know that because you were involved in it. Either you practiced it to learn that technical skills, you watched the event, you talked with someone about something, you participated in some activity, you dreamed something but cannot remember it clearly, you tasted something, you smelled something, you heard something, you thought something, you tried something, you read something and most commonly you or somebody else you know did some mistakes. That's how you can recognize and reflect about those knowledge. But there are other knowledge that seems to inherent to us, for what we conveniently deluded ourselves by believing "that knowledge" is just innate and that's how we were made. No, no, no. Nothing defies causality and nothing comes out magically out of nowhere. What are the anterior phenomenons operating behind this "innateness"? Unfortunately, we have just taken this "innateness" for granted, which is actually a placeholder term, quite idiotically. Alternatively, there are some misguided people who will still preach you to believe that human mind is a "tabula rasa". Oh fool! they don't have the slightest clue. There is no point of talking about those uninitiated minds and their self deceiving beliefs. The matter of fact that there are many "innate" knowledge and we are trying to understand it. To our dismay, this passive acceptance of "unexplainable" nature of the "innate" knowledge is acting as the greatest barrier for Gnosis. To overcome this barrier, you have to find out how you know something, or feel something without apparent awareness of participation to those events responsible for those innate knowledge. For example, what is the source of seeking attention? What is the source of seeking approval? Where does the concept of love come from? What is the source of the knowledge that enable our pattern recognition? What is the source of the knowledge of time? What is the source of the knowledge of cause and effect? Where does the knowledge of language come from? Don't just answer like a parrot saying "It's innate. It's innate. That's all we know!"

Were you there and participated when those "innate" knowledge was developing? Can you remember those times? Was your brain also there at that time when those event was in there incipient stage? If your brain was not there then how come you can have those knowledge that you called innate? As I mentioned above, you cannot have a knowledge unless you were somehow involved. Don't just give me the answer such as "Oh that thing! I born with those innate abilities". Think, and think hard. I am assuming you already straightened up your thinking skill by recommended thought training. If not, please read the essay titled "How valid is your thinking". Think using everything, not just by using your brain. After all your brain was not there in those primitive time and hence conventional logic is useless to handle this magnificent task.

You can start thinking from "Young's Double Slit Experiment". Although most of the physicist, including some Nobel laureates will tell you that nobody understands Double Slit Experiment, but in order to understand the source of your knowledge in the "lingo of science" you have to understand the true meaning of that experiment. Think sequentially like a photon, a particle, atom and then molecule. Think like water, rock, plant and then animal. Then think using whole human body with all its constituent elements and cells including those of your ancestors. Please notice, thinking from these levels, you cannot use logic and premises which is a product of your brain. You have to think beyond logic. Seems impossible? Do your homework and meditation. Then you will know how to use your imaginations and traces of occult memories imprinted on those primitive forms. Lastly think conventionally starting from the enteric nervous system. Then think from spinal cords and then brain stem. Then go up and think from limbic brain including pineal gland. Then go to next higher thinking apparatus of striatum, right hemisphere, left hemisphere, hippocampus and lastly prefrontal neocortex. If you can access and extract memories from all of those levels then you will see where does the innate knowledge comes from and how this knowledge exist as of now. Don't expect to achieve this level of knowledge after spending just an hour or so. What ever you genuinely achieved in your life, it takes time. For example, if you want to have a baby and raise him as your dream son, it takes time and genuine efforts of some 10, 15 or 20 years. How can you even imagine to achieve the greatest task of the whole creation itself will come to you so easy. Remember, there is no shortcuts. Only after the greatest endeavor of your life you will understand it. Time and efforts needed varies from 5 to 50 years or more, of sincere, continuous contemplation but the good news is, it's never late! This will take you to your original goal of understanding something that you already knew. And this will sooth your mind permanently and you will not ever be lost again.