This is what is referred to as the backlash, which is a law that works for better and for worse
"Every day, the events you witness or bring about and the people you meet lead you to have certain thoughts and feelings. Be aware, however, that depending on their nature and the strength you have given them, these thoughts and feelings follow a set course in space and then they return to their place of origin, in other words you. If these thoughts and feelings are righteous and generous, blessings will come to you, but if they were contaminated with a poison that stemmed from your head or your heart, do not be surprised if you too feel poisoned. This is what is referred to as the backlash, which is a law that works for better and for worse. Of course, even if you are a disciple of initiatic science, you will not suddenly become able to control your thoughts and feelings. The important thing is that you should be increasingly conscious of the significance of this law and your approach to it. After some time you will then not only be in control of your psychic life, but when harmful influences try to attack you, you will be capable of driving them away."