"Abba Joseph asked Abba Poemen, "Tell me how I can become a monk." Said the elder to him, "If you want to find repose here and in the age to come, say in every situation, ‘I, who am I?’ and do not pass judgment on anybody.""
January 1, 1970
https://en.wikiquote.org/wiki/Sayings_of_the_Desert_Fathers