The Church tells us that Lying is intrinsically evil and may never be done under any circumstances. The catechisms of John Paul II and Trent are both quite clear on this, as are bishops and popes all the way back to St. Augustine at least.
There are those who respond by saying, "This is not Church teaching. This is one of a number of teachings on Lying, all of which contradict each other. The Church is not teaching with any authority on this matter. It is mere theological opinion and may safely be ignored."
Well, it seems to me that all Christians would respect the authority of Holy Scripture, even if they argue about the authority of the Magisterium.
What then are the Apologists for Lying to make of this, from Revelations 21:8, where God Himself tells St. John what types of people will be barred from entering into the Heavenly Kingdom of the New Jerusalem ...
But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death (King James Version)
[In other words, all liars go to hell].
See also Rev. 21:27 where this is reiterated - he that "maketh a lie" will be kept out of Heaven. In the New American translation, "But nothing unclear will enter it, nor anyone who does abominable things or tells lies."
It seems to me that when liars are sent to hell along with murderers and idolaters, we had best take Church teaching on Lying seriously - and repent of our own lies, for it is simply the Truth that will set us free.
And that's more than theological opinion.
ADDENDUM - I added this to the combox, but it's worth adding here: it's not clear if it's God the Father telling St. John this stuff about liars going to hell or Jesus Christ, the Son. At any rate, there is a third reiteration of it, in Rev. 22:15, which is either Jesus speaking or John himself recapping the situation under the inspiration of the Third Person of the Trinity, the Holy Spirit - "For without are dogs, and sorcerers, and whoremongers, and murderers, and idolaters, and whosoever loveth and maketh a lie."
Now, dear readers, a hallmark of this debate has been that the Lying Apologists do not address points my side makes. They side-step them and throw other objections at us. When we address those other objections, the things we say in reply are ignored and new objections are thrown at us. And so on.
I'm tired of that technique. So if you wish to comment, please address what this post is about - GOD HIMSELF TELLING US THREE TIMES AT THE VERY END OF SCRIPTURE THAT ALL LIARS ARE SENT TO HELL. Please address that point - as it really can not be safely ignored.