Why do gu immortals persevere?

Some persevere because of hatred, some persevere because of justice, some persevere because of excitement and some persevere because of love.

whats my answer?

He was still expressionless, he continued to move forward relentlessly.

I had once screamed, gradually, I lost my voice.
I had once cried, gradually, I lost my tears.
I had once grieved, gradually, I became able to withstand everything.
I had once rejoiced, gradually, I became unmoved by the world.

And now!
All I have left is an expressionless face, my gaze is as tough as a monolith, only perseverance remains in my heart.

This is my own, an insignificant character, Fang Yuan’s — Perseverance!