Here is a reposting of an article that I wrote a while back, for your enjoyment.
The difference between philosphy and poetry is that philosophy reveals and identifies, while poetry reveals the unidentifiable. This is why a good poet must be a philosopher, while a philosopher must not necessarily be a poet. Often, the more literalistic philosopher downplays the importance of poetry for the very reason that he cannot see the truth of poetry, because he cannot identify it. However, the purpose of all good art is to touch upon something that is far greater than human experience can acheive on this earth. Poetry acheives what philosophy aims for, which is truth. The only difference is that the truth acheived by poetry is so profound, it is inexpressible. This is a testament to the mysterious power of poetry, for the poet has the ironic talent of using words to express a truth for which there are no words.