Can you modify the HTML of the page? If so, try using this:
<script async defer src="//assets.pinterest.com/js/pinit.js"></script>
<a data-pin-do="embedBoard" data-pin-board-width="600" data-pin-scale-height="400" data-pin-scale-width="80" href="https://www.pinterest.com/marykayus/inspirational-quotes/"></a>
That will give you a widget that looks like this:
You can change the URL in that markup to whatever Pinterest board that you want shown.
"We are a way for the cosmos to know itself." - Carl Sagan
"I do not fear death. I had been dead for billions and billions of years before I was born, and had not suffered the slightest inconvenience from it." - Mark Twain
An open mind is willing to consider new ideas, while provisionally accepting those backed by empirical evidence, and provisionally rejecting those without.