Who said "Sometimes you need to be alone to understand yourself."?

This quote is attributed to Sully.

Sometimes you need to be alone to understand yourself. - Sully

"Sometimes you need to be alone to understand yourself."

Sully Solitude

"I'm not listening to this. We're going back out there."

"We laugh, we cry, we fall in love."

"You really are a bad friend."

"I'm watching you, Wazowski. Always watching. Always."

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."