The most exciting thing about quantum computing is that it challenges our understanding of the very nature of computation itself.
The more you sweat in peace, the less you bleed in war.
The present state of the system of nature is evidently a resultant of what it was in the preceding moment, and if we conceive of an intelligence which at a given instant comprehends all the relations of the entities of this universe, it could state the respective positions, motions, and general effects of all these entities at any time in the past or future.