You and i

One must exists in order for the other to as well. Happiness and sorrow. Pleasure and pain.
Free will may have been predestined by the environment.

Link: https://www.brainpickings.org/2014/07/25/c-s-lewis-problem-of-pain-free-will/

To quote Haruki Murakami's Hard-Boiled Wonderland & The End of The World:

First, about the mind. You tell me there is no fighting or hatred or desire in the Town. That this is a beautiful dream, and I do want your happiness.

But the absence of fighting or hatred or desire also means the opposites do not exist either. No joy, no communion, no love.

Only where there is disillusionment and depression and sorrow does happiness arise; without the despair of loss, there is no hope.