"ほとんどの人は最初の息で十分に走らずに、二番目の息があることに気付かない。"

Simplified Meaning:

Often, when people set out to achieve a goal, they give up too soon because they get tired or discouraged. They don't push themselves enough to discover the extra energy and strength they actually have. Imagine someone starting to jog for the first time; after a short run, they feel exhausted and stop. However, if they kept going a bit longer, they would likely find their second wind – a burst of energy that revitalizes and allows them to keep going with less effort. In life, this idea means that perseverance can help you unlock hidden reserves of strength or creativity. It suggests that by pushing through initial struggles or fatigue, you might find new capabilities within yourself that you didn't know you had. Applying this to your life, if you're working on a challenging project or trying to develop a new skill, don't quit at the first sign of difficulty. Instead, keep pushing forward a little longer; you may surprise yourself by finding additional motivation and success just beyond that initial tough phase.