"Subjection to fear is weakness, bondage, feverish unrest. To be afraid is to have no soul that we can call our own; it is to be at the beck and call of alien powers, to be chained and driven and tormented; it is to lose the life itself in the anxious care to keep it."

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Suppose aliens invade the earth and threaten to obliterate it in a year's time unless human beings can find the Ramsey number for red five and blue five. We could marshal the world's best minds and fastest computers, and within a year we could probably calculate the value. If the aliens demanded the Ramsey number for red six and blue six, however, we would have no choice but to launch a preemptive attack.

— Paul Erdos