The basis for honesty are arguments for development of a an egalatarian relationship. If the relationship is not based on equality then dishonesty is an inevitable result in resolving moral dilemmas. In the example case there is no reason to consider whether or not deception in words should mirror the deception of hiding filthy Jews. To split hairs further the ability to convey the truth is absolutely impossible in language. The allusion of of the 1st quote is towards this understanding: anything contained in language is only an approximation of the truth. So how honest can we really be?