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Love- you can't bank on it... it's an unsafe bridge. The only thing you can bring to the bank? Money.
— Richard ‧ Ally McBeal

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Richard says love is an unsafe bridge and can't be banked. Only money can be brought to a bank. It's a cynical joke, using banking language to argue that feelings won't pay for anything, while cash always will.
Context reviewed