Careful Words

observance (n.)

But to my mind, though I am native here

And to the manner born, it is a custom

More honoured in the breach than the observance.

William Shakespeare (1564-1616): Hamlet. Act i. Sc. 4.

  Suit the action to the word, the word to the action; with this special observance, that you o'erstep not the modesty of nature.

William Shakespeare (1564-1616): Hamlet. Act iii. Sc. 2.