It’s a lot easier to fall down than it is to get back up. No doubt, it takes a lot more energy and physical demand on the body to “come back” up after falling down.
This is a great literal illustration of the comeback always being stronger than the setback. Similarly, this quote, by Brian Tracy, is about the amount of effort and grit required to come back from the things that set you back or get you down in life. The effort and grit required are much stronger and more powerful.
Meanwhile, this quote is also about not being defined by your setbacks. If the comeback is stronger, be proud of it. Own it. Let that be what defines you.