The lines you are referencing are:
> "If you can meet with Triumph and Disaster
> And treat those two impostors just the same;"
Here, Kipling is suggesting that a true poet must be able to handle both success and failure with the same equanimity. This implies a level of patience and resilience, the ability to weather the ups and downs of life without losing sight of their artistic goals.
Throughout the entire poem, Kipling emphasizes qualities like perseverance, humility, and composure in the face of adversity. These traits are all tied to the ability to wait and not be tired by waiting.
A poet who embodies these qualities will have the strength and fortitude to see their work through, even when faced with challenges.