The breach of custom is breach of all. [ William Shakespeare ]

Oftentimes, excusing of a fault
Doth make the fault the worse by the excuse;
As patches, set upon a little breach.
Discredit more in hiding of the fault,
Than did the fault before it was so patched. [ William Shakespeare ]

A custom - More honoured in the breach than the observance. [ William Shakespeare, Hamlet ]

It is a custom. More honored in the breach than the observance. [ William Shakespeare ]

Every day is a rampart breach which many men are storming; fall in it who may, no pile is forming of the slain. [ Johann Wolfgang von Goethe ]

To doubt is an injury; to suspect a friend is breach of friendship; jealousy is a seed sown but in vicious minds: prone to distrust, because apt to deceive. [ Lord Lansdowne ]

A man may with more impunity be guilty of an actual breach, either of real good breeding or good morals, than appear ignorant of the most minute points of fashionable etiquette. [ Sir Walter Scott ]