Be not disgusted, nor discouraged, nor dissatisfied, if you do not succeed in doing everything according to right principles, but when you fail, return back again, and be content if the greater part of what you do is consistent with man’s nature. Love this to which you return, and do not return to philosophy as if she were a master, but act like those who have tired eyes and apply a drenching with water. Then you will not fail to obey reason, and you will repose in it.

Marcus Aurelius (121 – 180)