Imagine yourself you are the first human in earth and you know nothing about it, you are trying to learn how to move and you failed alot of times, then you understand the "secret of moving" and you don't fall, from that experience you think you will never fall, you are now moving from a place to another and then you see a a really big hole, you know nothing about gravity and from experience you think that there's no way to fall from your new way of walking, you try to walk on it then you fall, then you gain another experience and that is you can fall even if you discovered a new way to move, from this you understand that even if you understand something you can fail on it and this is all thanks to observation. — Jalal1002

Observation is an instinct, it is the tool that living creatures use to interact with the world's changes and its multiple frames.
Observation has evolved through the centuries, we can name it also the source of wisdom, it is gradually gained, so if we go to the past, it is gradually getting lower form now to the time the first human has been born.
Imagine yourself you are the first human in earth and you know nothing about it, you are trying to learn how to move and you failed alot of times, then you understand the "secret of moving" and you don't fall, from that experience you think you will never fall, you are now moving from a place to another and then you see a a really big hole, you know nothing about gravity and from experience you think that there's no way to fall from your new way of walking, you try to walk on it then you fall, then you gain another experience and that is you can fall even if you discovered a new way to move, from this you understand that even if you understand something you can fail on it and this is all thanks to observation. — Jalal1002