Distinguish between thoughts: Elder Sergei of Vanves

"Take care to distinguish between your thoughts, as the Fathers teach. Stop and look, decide which ones are good and which ones are bad. Then, disassociate from any that you find to be bad, believe nothing they tell you, do not believe for an instant that they are a part of who you are. This is of the utmost importance, because if we accept bad thoughts, then they will stay with us and make us believe that they are actually a part of us."