Here is a beautiful lesson about Life impressions from Vernon Howard in The Mystic Path to Cosmic Power :
“What kind of impression are you making on yourself? It is self-enriching to find out.
Every twenty-four hours you receive thousands of positive and negative impressions. They come from outside and within. You see a glittering lake or you overhear a gloomy remark, or someone smiles at you — and you have three separate impressions. You suddenly recall an incident from yesterday or wonder about tomorrow’s weather — and have two more impressions…
“Impressions flow in a constant stream; you need do nothing to invite them and you cannot stop them. But the kind of impressions admitted to your mind make your life what it is.
“Upon reaching a certain level of psychic awareness, you have the power to receive only healthy impressions, the cheery and helpful ones. If negative impressions come your way, you will be able to stop them before they penetrate to make you sad or upset. Unhealthy impressions are like theives in the night, who steal your psychic riches leaving you poor and exhausted. You cannot stop them from trying to enter, but you can prevent them from actually penetrating. By becoming aware of them, by exposing the thieves in the night, you destroy them. It is as if you have the magic ability to dissolve a flying stone before it strikes you.
“There are millions of beautiful impressions and they are all for you. They are enough to make you a supremely happy man, or woman. You need only exclude the unwanted impressions and welcome the happy ones.”
Inner Life Exercise
Simply watch and be curious to see the impressions you are making on yourself: in the morning, at work or school, during lunchtime, at dinner and during the evening. Also be alert to the impressions you are having as you fall asleep. You are separating from your thoughts and feelings that keep you driven and tired during your days. Good things will happen if you stick with this exercise.