Brahms and Wagner differed in their approach to composing music. Wagner believed there should be a story behind his creations. Each piece with a distinct meaning that could be explained.
Meanwhile, Brahms did not need a story to write. He believed a composition could stand on its own. The story was the piece itself, no background description or plot was necessary.
Today, the world requires us to have a philosophy behind our work. Why did you create this? What purpose does it serve? If you don't have a reason, your work is somehow less valid.
Be challenged to create, even if you don't know what it's for. An idea can live on it's own. Don't wait until you have a philosophical defense before starting something new.