What is CUI BONO

For whose good; for whose use or benefit “Cui bono is ever of great weight in all agreements.” Parker, C. J., 10 Mod. 135. Sometimes translated, for what good, for what useful purpose. Cuicunque aliquis quid concedit con- cedere videtur et id, sine quo res ipsa esse non potuit. 11 Coke, 52. Whoever grants anything to another is supposed to grant that also without which the thing itself would be of no effect