A caution about rules

CAUTION.— Do not allow rules to hamper you while you are writing. Use them only in revising work.
Otherwise you will be in the same state of mind as the centipede whose bewilderment is described in the following :
"The centipede was happy quite
Until the toad for fun,
Said, Pray, which leg goes after which ? '
Which worked her soul to such a 
pitch She lay distracted in the ditch,
Considering how to run."
category:Writing techniques