《旧唐书·列传·卷二十一》
没有信义的言语，没有诚意的命令，对上就会败国，对下就会危及自身，即使在狼狈困顿之中，君子也不会言无信、令不诚。
不信之言，无诚之令，为上则败国，为下则危身，虽在颠沛之中，君子所不为也。
Words without credibility and orders without sincerity will lead to the loss of the country if imposed on the superiors and to the endangering of oneself if imposed on the subordinates. Even in the most desperate situations, a gentleman will not make empty promises or give insincere orders.