Did the bitterness of life diminish on its own, or has my patience and endurance grown immensely?

The poet wonders in quiet astonishment whether life's bitter hardships have truly softened on their own, or if his capacity for endurance and patience has simply grown so vast that pain no longer stings. It captures that poignant stage of enduring sorrow where grief becomes second nature. The relief felt is not because the world has turned kinder, but because the weary heart has quietly learned to bear the heaviest burdens without breaking.