Why are most of the impressions that we gathered in our mind unconscious?

We filter out so many things in our environment just so we can navigate through life. We don’t hear sounds that birds and animals can hear. We don’t see infrared or ultraviolet light that other creatures see. If we took in everything around us at the time, we would be dazzled by it all, and so we perceive the world as humans do—in a very narrow perspective—compared to what is “out there.”

So it is with our conscious and subconscious minds. We simply could not function if every memory of this life and past lives flooded our brains. But everything that happened to us, especially trauma, is stored in the subconscious mind. This is where all the messages of our particular culture are resting. It is where everything our caretakers taught us about who we are, what we are, and how “good” we are resides.
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Our conscious minds are our survival mechanisms but the subconscious mind is behind so many of the decisions we make. We usually cannot access our subconscious mind and yet it is doing a lot of work in the background. The subconscious was formed when we were too young to have discriminating intelligence or the ability to form our own opinions. And it sits there, unseen and undetected, like the huge hidden mass of an iceberg.