One of my favorite authors ever (I do have many), J. K Rowling, offers up numerous inspirational and wise quotes with the above being one of her best.
Too often people give up after they have a failed attempt at something. That attempt though was ‘trying’ which is a success in its’ own right.
Writers and illustrators know the word failure all too well. If they give up after a few rejections, then they are certainly NOT made out for this career. However, if they keep writing, keep illustrating, they will succeed eventually. This is just how the universe works. Trials and tribulations are part of growing and one does not quit growing or learning simply because of age.
My best pitch to you is this:
The road to success is to incur failure on your way.