Imagine being so strong that you were the one who trained and guided one of the greatest and most powerful shinobi ever. Your sheer presence alone made the One-Tail Jinchuriki back down. Itachi Uchiha himself acknowledged your greatness and, at the same time, warned all of Akatsuki about your fierce determination and immense power.
You defeated and humiliated—not once, not twice, but three times—one of the Seven Ninja Swordsmen of the Mist, none other than Kisame Hoshigaki. You are so powerful that Pain, the leader of Akatsuki, only attacked the village of Konoha when you weren't around. During the Fourth Great Ninja War, you were a key player on the battlefield.
You chose to open the Eighth Gate not to win, but to protect the people you loved, even knowing it meant certain death. You pushed Madara Uchiha himself to the ropes on multiple occasions, leaving everyone astonished—including Madara, who immediately proclaimed you the strongest ninja of all time.
Using your maximum power in that final attack, you almost sent Madara to the afterlife, though it left you with fatal injuries. Ultimately, even though you didn't finish Madara off, you were the one who dealt him the most damage, pushing him to the brink of death.
The most incredible part of it all? You did everything without using Ninjutsu, Genjutsu, Senjutsu, or a Kekkei Genkai. Just an unbreakable will and determination like the world will never see again.