“You must persist”

From an e-mail Elizabeth Warren sent this morning to donors, announcing the suspension of her campaign for the presidency:

So if you leave with only one thing, it must be this: Choose to fight only righteous fights, because then when things get tough — and they will — you will know that there is only option ahead of you: nevertheless, you must persist.

That sentence brought unexpected tears to my eyes.

[“Donors”: yes, that would be our household. I think Warren’s sentence should read “only one option.” But I didn’t notice until almost twelve hours later.]