To Never Falter.

He's a hero, he can't give up now. Not when he's so close to achieving his goals. The temples are clear, the Sages have awoken, the Princess has been kidnapped. Everything's set for the battle, like pieces of a chessboard, and he's right in the middle of it. He has to be strong and powerful, ready to take anything head first.

He's the Hero of Time, after all, it's his destiny to destroy evil and return the world to it's former splendor. He's going to defeat Ganondorf as it's been said by prophecies and leyends, and once he does, peace will come back and everyone will be happy again.

Everyone but the Sheikah that has already died trying to protect him. Or himself, who's too heartbroken to falter.

He will never falter,  he will never doubt his mission... but he'll never smile honestly again, not after this.