A fox may grow grey, but never good. 狐狸会变,但本性难移。
A friend exaggerates a man's virtue, an enemy his crimes. 朋友宣扬人的美德,敌人夸大人的罪过。
A friend in court is better than a penny in purse. 曩中有钱,不如朝中有友。
A friend in need is a friend indeed. 患难朋友才是真朋友。
A friend is a second self. 朋友是另一个我。