Be careful what you wish for (Or: This won't end well)

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This excellent point is usually attributed to Thomas Jefferson, but the curators of all things Jefferson at Monticello insist that there is no evidence he is the source.  They also note that other claimed sources, such as Barry Goldwater and Gerald Ford, are also spurious, although they are known to have employed the quote in their speeches.

As far as documentary evidence goes, the earliest written examples of the quote date back to the early 1950s; the original sage seems to have vanished into the mists of history.

Regardless of the quote's parentage, the point remains valid and deeply profound.  In my opinion, we are likely to see its validation in many unpleasant ways in the coming years and decades.