Littlewood's proof... revealed that prime numbers are masters of disguise. They hide their true colours in the deep recesses of the universe of numbers, so deep that witnessing their true nature may be beyond the computational power of humankind. Their true behavior can be seen only through the penetrating eyes of abstract mathematical proof.

The Music of the Primes, Chapter 5 (p. 130), HarperCollins Publisher, Inc. 2003