It's Bigger than both of us

Where did this originate? What is it's meaning? Thankyou so much! (waclice@aol.com)--I think it means a situation or an attraction to someone)

I've heard it used a lot in a somewhat facetious way, as though referring sarcastically to a somewhat Pollyannish saying about events or conditions more important than the lowly concerns of you or me or both of us together. Sorry I can't get closer than that. Do you have some context or source? SS