Well

Songwriting is the portrayal of experience. Unlike many other crafts, it doesn't take a formula of dedication, motivation and persistence to the same degree to create something beautiful and meaningful. Making something beautiful and meaningful require an intense desire to reflect experience from a persons life into it's aural manifestation. Thus it's dependent on living and what a person has done in their lifetime, which isn't why hard work is scaled to successfulness in music.

This is why so many people, who would otherwise be deemed fuck ups by society are worshiped as musicians. This is why those repressed by society (at least to some degree) don't comprehend the depth that goes into that simple 4 chord progression that they think they could've come up with, but didn't (and couldn't).

Passion, motivation (temporary or long-lasting) and talent are the means to the end, but persistence and understanding hardly play into the equation. For certain individuals who encompass the first three characteristics, the latter traits may enhance them, but will not replace them. Although there aren't many definite examples, its pretty obvious that Radiohead, The Beatles, Modest Mouse, or My Bloody Valentine demonstrate these principles. I don't wish to be them, but I wish to be great like them.