One does not permit one's ...

One does not permit one's friends to be slandered in time of trouble.
 Frances Parkinson Keyes

Quotes from the same author

Of all the men I have known, I cannot recall one whose mother did her level best for him when he was little who did not turn out well when he grew up.
 Frances Parkinson Keyes
Fortunately, any kind of setback has represented a challenge to do better, rather than an acceptance of inferiority on my part.
 Frances Parkinson Keyes