This is a phrase I say to myself throughout the day, to help keep me in state. I use to have a bad habit of making unnecessary excuses and explanations for my actions, coupled with apologizing too often.

This reminds me to ignore comments from others that I do not need to respond to. Also, it reminds me to not offer excuses or explanations for my actions, unless it is completely necessary. This helps to simplify social interactions, and ensures others do not affect my mental state.