Gratefulness is the real gain.
Do not blame, criticize or condemn the people who fall in error or fail, but be thankful to them, because they will allow you to recognize in yourself the very cause of all your failures and errors. Remember! The others are you yourself in time, and you are the others in absence of time. So, be all gratitude to them! “Gratefulness is the real gain.”
Be secretly thankful to all people you encounter and especially to those who criticize you, accuse you, condemn you and even persecute you - “you'll hardly be able to pay back what you owe them.”