There is no such thing as truth either in the moral or in the scientific sense. The needs of the State are the sole determining factor. What may be necessary today need not be so tomorrow. This is not a question of theoretical suppositions, but of practical decision dictated by existing circumstances. Therefore, I may – nay – must – change or repudiate under changed conditions tomorrow what I consider correct today.

Adolph Hitler
Rauschning
The Voice of Destruction, pp. 223
[The discovery of the relevence of this quote to present day politicians and others will be left as an exercise for the reader.]