Who said "Well, you can't be something you're not."?

This quote is attributed to Dory.

Well, you can't be something you're not. - Dory

"Well, you can't be something you're not."

Dory Truth

"Just keep swimming, just keep swimming, what do we do? We swim, swim, swim!"

"I suffer from short-term memory loss."

"When life gets you down, you know what you gotta do? Just keep swimming."

"I'm sorry, what were we talking about?"

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."