Every poet has their own disctinct definition of poetry. Poetry is personal; it holds the essence of revolution and evolution. It persuades and inspires. Its possibilities are infinite. With poetry, we create; we shape the possible and give life to the seemingly impossible. How do you define poetry?
Poetry is nearer to vital truth than history. ~Plato, Ion
Out of the quarrel with others we make rhetoric; out of the quarrel with ourselves we make poetry. ~W.B. Yeats
The distinction between historian and poet is not in the one writing prose and the other verse... the one describes the thing that has been, and the other a kind of thing that might be. Hence poetry is something more philosophic and of graver import than history, since its statements are of the nature rather of universals, whereas those of history are singulars. ~Aristotle, On Poetics
source: The Quote Garden