This quote means that when you make mistakes, it's actually a sign that you are trying and doing something. Imagine if you never made any mistakes, it would mean you're not attempting new things or learning. So, making mistakes is like evidence that you are taking action and trying to achieve something.
Think of it like this: when you're learning to type on a keyboard, you might hit the wrong keys and make errors. But those mistakes show that you're practicing and improving your typing skills. If you never made any mistakes, it would mean you're not practicing or challenging yourself.
In life, making mistakes is a natural part of learning and growing. So, don't be discouraged by them. Instead, see them as a positive sign that you're on a path of progress and development. Embrace your mistakes, learn from them, and keep moving forward.