Yes, We can know everything.

Our entire world is expressible in words, otherwise it does not exist. Subconscious is the tendency, ego tendency, and conscious too is this ego tendency. The conscious mind is the one in which the ego tendency has taken the shape of images, sounds, words, forms, symbols; symbols of any kind, they may not necessarily be words.

https://medium.com/@acharyaprashant/how-to-know-the-subconscious-mind-43a23072650e