Is the "Patience will untie it" rhyme a reference to something?

In The Flash Season 3, there are a couple of episodes (such as 3x06 "Shade" and 3x11 "Dead or Alive") where H.R. and later Cisco have said a rhyme that goes like this:

"If a string is in a knot, patience will untie it. Patience can do lots of things, have you ever tried it?"

Is this a reference to something? Unfortunately, searching online only turns up irrelevant results or copies of the show quote for me.

Best Answer

This might be a nursery rhyme called Patience by Anna Maria Pratt. Pratt was a teacher for several years in Cleveland, Ohio. Her focus was on children's literature, and she published Little Rhymes for Little People in 1896.

Patience

If a string is in a knot,

Patience will untie it.

Patience can do many things—

Did you ever try it?

If it was sold at any shop

I should like to buy it.

But you and I must find our own—

No other can supply it.

--Anna M. Pratt