The etymology of "persevere" is "per" and "severe," which literally means "very strict." I find that interesting...
"Severe" likely has its root in the Latin "se vero" - which means "without kindness."
True perseverance is unforgiving and unrelenting. It implies a true discipline of schedule and effort. It doesn't care if you're tired or sick of it.
Try, try again... this little poem comes from Bill Bennett's "Book of Virtues," which I read to my kids when they were young. This impacted them more than I know. My youngest of the first batch, Aaron, came up to me tonight and asked me to design a tattoo of the poem. He wants to have it done.
You see my design up above... we'll see if someone in town can do this.
Tattoo'd into him... wow. If there's a lesson I could have wished for any of my kids to learn, it would have been that one.