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Goethe's celebrated "grau teurer freund ist alle theorie" has girdled the globe in the century since Mephistopheles undertook to answer his student interlocutor.
Yet despite the great poet's admonition concerning theory, the involvement of the theoretician in human affairs grows greater, never smaller, which every advance of man's knowledge.
The observation that life is a swallow and theory a snail is a truism which commends itself to seekers of the truth from every age. Whether they be medieval alchemists in quest of the Golden Grail, or 15th Century explorers seeking to persuade wealthy patrons of the errors permeating schoolman geography.
Stated succinctly, pragmatically, and with conscious deference for that much maligned damsel, Truth, the theory and progress have long been congenial synonymous terms.