There are only a few things in life that are important. These tropes and archetypes recur and recur.
This presents the artist with a dilemma--focus on the important things, and risk seeming derivative, or focus on being original at the risk of spending one's efforts on the trivial.
To me, much of modern art smacks of the latter, to its detriment.
Focus on what's important to you. The important things always bear repeating.
(posted in response to this post by my old classmate Lindsey, in which she notes, "I feel frustrated, sometimes, by the fact that I seem to write the same thing over and over.")