"I have forgiven myself; I'll make a change. Once that forgiveness has taken place you can console yourself with the knowledge that a diamond is the result of extreme pressure. Less pressure is crystal, less than that is coal, less than that is fossilized leaves or plain dirt. Pressure can change you into something quite precious, quite wonderful, quote beautiful and extremely hard."

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We used to be a source of fuel; we are increasingly becoming a sink. These supplies of foreign liquid fuel are no doubt vital to our industry, but our ever-increasing dependence upon them ought to arouse serious and timely reflection. The scientific utilisation, by liquefaction, pulverisation and other processes, or our vast and magnificent deposits of coal, constitutes a national object of prime importance.

— Winston Churchill