Who said "I was trained by the greatest. Yet still, I am not enough."?

This quote is attributed to Kylo Ren.

I was trained by the greatest. Yet still, I am not enough. - Kylo Ren

"I was trained by the greatest. Yet still, I am not enough."

Kylo Ren Perseverance

"I feel it again... the pull to the light."

"Supreme Leader Snoke believes you are the future, but you continue to fail."

"Forgive me. I feel it again, the pull to the light."

"Show me again. The power of the darkness."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."