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Re:Announcing .NET Core 1.0 by LeonB on Monday June 27, 2016 @06:33PM (#11990052)
Re:Announcing .NET Core 1.0 by jsingleton on Tuesday June 28, 2016 @03:29AM (#11992059)
That tweet dates from 2010 and the same quote is on this page [0] dated 2009. Of course, it's possible Martin updated it after the initial publication. I'm not saying you copied it either, it could have been independently created.

[0] http://martinfowler.com/bliki/TwoHardThings.html