The Strongest Can Fall
You can be physically strong, have all the right muscles, but easily give up in a challenging fight. You can be the most talented person in your field, and still get left behind by peers who have more drive and grit.
What good are your muscles, if you can't fight long enough to win? If you easily tire—physically and emotionally? If you can't find the strength to get up after falling down two times?
What good is your talent, if you readily surrender when faced with difficulty? If you cannot bounce back from failure?
Strength isn't enough. Talent isn't enough. Match your capabilities with toughness—the ability to keep going when faced with difficulties. To have perseverance. Resilience. Fortitude. To not only get back up, but to rise stronger, more determined, more focused.
Because whatever your goals are, however you see your life in 10 or 20 years, your path is going to be filled with challenges. Such. Is. Life. And to get to the finish line, to find success, you need the toughness to conquer them all.