Today's quote: The advantage of truth

Men are not more zealous for truth than they often are for error, and a sufficient application of legal or even of social penalties will generally succeed in stopping the propagation of either. The real advantage which truth has, consists in this, that when an opinion is true, it may be extinguished once, twice, or many times, but in the course of ages there will generally be found persons to rediscover it, until some one of its reappearances falls on a time when from favorable circumstances it escapes persecution until it has made such head as to withstand all subsequent attempts to suppress it. -John Stuart Mill

Okay, but what if it's never rediscovered?