I don’t usually blog about typographical errors because I tend to assume that they are more a slip of the finger than of the intellect. Just the same, I can think of a couple places where typos are verboten. Your résumé is one. Aphorisms are another.
As a rule, any time you leave a stupid mistake in something you write, it gives the lie to your competence, wisdom, status; whatever your writing is trying to accomplish. (Since I write about mistakes in writing so much, I even proofread my emails and instant messages. People are delighted when they find that I made a goof.)
Here’s a case in point.
A nice piece of wisdom, perhaps, but you wonder who would allow that apostrophe in there. I’ll give the writer the benefit of the doubt and say it was a slip of the finger, but I still say PROOFREAD!