John Maynard Keynes

'The master-economist must possess a rare combination of gifts. He must reach a high standard in several different directions and must combine talents not often found together.
He must be mathematician, historian, statesman, philosopher – in some degree. He must understand symbols and speak in words. He must contemplate the particular in terms of the general, and touch abstract and concrete in the same flight of thought.
He must study the present in the light of the past for the purposes of the future.'