When forced to work within a strict framework, the imagination is taxed to its utmost and will produce its richest ideas. Given total freedom, the work is likely to sprawl.
T. S. EliotPoets in our civilization, as it exists at present, must be difficult...The poet must become more and more comprehensive, more allusive, more indirect, in order to force, to dislocate if necessary, language into its meaning.
T. S. Eliot