Who said "If I didn't believe it, why should you?"?

This quote is attributed to Bill Murray.

If I didn't believe it, why should you? - Bill Murray

"If I didn't believe it, why should you?"

Bill Murray

Comedian Actor American Born 1950 (age 76)

"So I got that going for me, which is nice."

"The way to deal with an afraid person is to give them an attitude adjustment."

"If you have to think about whether you trust someone, then you don't trust them."

"Knowing how to be solitary is central to the quality of life."