Why according to foster is it more difficult to write a short poem than a long one?

A short poem is more difficult to write because it must be perfect.

Foster felt that writing short poems is much more challenging than writing long poems. The rationing of space makes every word count even more than it does in a long poem. Every word must have weight and meaning. This requires a lot of skill and is mentally demanding for the writer.

The repetition of initial consonant sounds is called alliteration