everything you think makes an impact. a thought is created when you think, and that thought does not go away just when you stop thinking it. the thought enters your subconscious and stays their in your mind, manifesting itself in dreams, body language, intuition, etc. influencing your thoughts and actions subconsciously.

the words in the music you hear, in the books you read, and from conversations you eavesdrop on; the things you see looking out the car window, on the television screen, in your own living space. all this enters your mind through your senses.

a dream, for example, causes a chain reaction, where you wake up with the feeling of the dream, whether that is horror from violence or fear from losing a loved one, or joy from achievement or love from a dream of passion. these dreams are grown from a seed planted in the subconscious by the once conscious mind.