If necessity is the mother of invention, then dissatisfaction must be its father.

Necessity... the mother of invention.

Love is a coin that cannot be bought or sold but must be given.

They say that necessity is the mother of invention, and when the necessity is survival she can be one mean mother, but it's her child invention that's the real dangerous one.

Necessity, they say, is the mother of invention, but fear, too, is not barren of ingenious suggestions.

Curiosity and not necessity is the mother of all inventions.