The title of this post is a very common saying, and there is some truth to it. (elearning.net)
There is one common saying in business that you can learn more from your failure than from your success, which is also so true when it comes to how to find cougars of your liking. (beyondages.com)
On the one hand, we have common sayings like to err is human and learn from your mistakes. (gse.harvard.edu)