Hard work - I mean, does anybody use that term anymore? Laziness doesn't fly. It's all in the practice. It does take work and it ain't easy - but man, the rewards!
All of the biggest technological inventions created by man - the airplane, the automobile, the computer - says little about his intelligence, but speaks volumes about his laziness.
Much literary criticism comes from people for whom extreme specialization is a cover for either grave cerebral inadequacy or terminal laziness, the latter being a much cherished aspect of academic freedom.
There's much to be said for feeling numb. Time passes more quickly. You eat less, and because numbness encourages laziness, you do fewer things, good or bad, and the world's probably a better place for it.
I don't think necessity is the mother of invention. Invention, in my opinion, arises directly from idleness, possibly also from laziness - to save oneself trouble.