“Life is like playing a violin solo in public and learning the instrument as one goes on,”—Samuel Butler.
Life is not going to teach you theories. Everything you learn and everything you will ever be must come through daily practice. Take note of those little mistakes you make, for therein lies the through path to real and lasting success.
Some actions may cause us to mourn over our decisions, but in actual fact, there are still some lessons to be picked up from those little mistakes. Mourn over certain decisions and steps, but do not remain in that situation forever—move and make the most of it to become a successful person.