Good faith is a seldom guest, when you have him, hold him fast. (German) Good faith stole the cow. (German) If good faith be abolished, all human society is dissolved....

Good faith, or in Latin bona fides (the inflected forms bonae fidei and bona fide are also used), is the mental and moral state of honesty, conviction as to the truth or falsehood of a proposition or body of opinion, or as to the rectitude or depravity...