Who said "That's the truth of the matter."?

This quote is attributed to Droopy.

That's the truth of the matter. - Droopy

"That's the truth of the matter."

Droopy Truth

"I'm so happy."

"Hello, I'm so glad to see you."

"That makes me so sad."

"I'm afraid I have some bad news."

"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."