What’s a piece of advice you received that completely changed how you view life?

There are two pieces i received first forgive selfishly because the more you forgive your parents your family and others but most especially yourself the more easily you will be able to find peace and two be grateful for everything no matter how small for the past is history the future is a mystery but today is a gift that is why it is called the present

My councelor told me "Would you talk to your friends the way you talk to yourself?" That completly changed the way i view my own thoughts