请高手讲解下面一个英语长句的意义和语法关系."And the lesson of that is,'Be what you would seem to be' or to say it simply,'Never imagine yourself not to be otherwise than what it might appear to others that what you were or might have been was not otherwise than what you have been would have appea

请高手讲解下面一个英语长句的意义和语法关系.
"And the lesson of that is,'Be what you would seem to be' or to say it simply,'Never imagine yourself not to be otherwise than what it might appear to others that what you were or might have been was not otherwise than what you have been would have appea