"Do not give what is holy to dogs, neither throw your pearls before swine, that they may never trample them under their feet and turn around and rip you open." (Mt 7:6) That is why Jesus on certain occasions refrained from giving full information or direct answers to certain questions when doing so could have brought unnecessary harm. (Mt 15:1-6; 21:23-27; Joh 7:3-10)
Yes, but those 'holy pearls' are examples of truth and not of lies, are they not? Doesn't that example show that you shouldn't waste speaking the truth on dogs or pigs? I don't see how that could be showing how you should 'lie for the truth'.
dc