John 8:44 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
Christianity is very rare among moral systems in prohibiting lying as a general rule; and I think this relates to our more deeply-rooted understanding of this sin.
Secular discouragements against lying are based around the inexpediency of dishonesty overall and in the long term. A lie is mostly committed because it is expedient to gratification in the short-term - so the lie needs no 'hedonic' justification (assuming one gets-away-with-it).
But a 'system' in which the individuals are dishonest is inefficient, and may be ineffective. So even mainstream secular authorities try to encourage and enforce honesty among the workforce - at least under most conditions (unless where subordinate is instructed to lie by a superior).
This is most clearly seen in science. The value of science for increasing human happiness and diminishing suffering absolutely depends upon scientists seeking and speaking truth. But in any specific circumstance, it is nearly-always expedient for a specific scientist (or any person 'using' science) to be expediently dishonest - whether at the level of exaggeration of hype and spin, by selectivity and distortion - or outright fabrication and public denial of what one (secretly) believes to be correct.
Therefore, since Christianity ceased to the basis of motivation for scientists and Western society (gradually, but very completely over the past three or four decades); science has become more and more dishonest because there was no reason Not to be dishonest, and innumerable (hourly) reasons to be as dishonest as one can get-away-with...
Until science ceased to be science - and became assimilated as a part of the bureaucratic structure of mainstream, modern, Leftist culture.
My point is that dishonesty is one of the major tools of evil. If the sexual revolution has been the battering ram by which the powers of evil have corrupted, the insidious expansion of dishonesty has been what made this possible; and the increasing severity and pervasiveness of dishonesty in Western public discourse has been perhaps the single largest manifestation of the triumph of evil.
A Christian cannot do much about the mass of public discourse; but my impression is that Christians themselves are insufficiently aware of the evil of dishonesty; and this has been a major cause of the corruption and apostasy of those Christians who have resisted the lures of the sexual revolution.
This happens at the group level of churches and denominations, and at the level of individuals. What may start with 'public relations', publicity, advertising, consciousness-raising, damage control... spirals to become vast structures of systematic dishonesty. Examples would include the notorious 'cover-ups' of churches in relation to sexual or financial abuses.
But at an individual level there are innumerable Christians whose jobs require them to be increasingly and ever-more-extremely dishonest. Yet this plain fact of life is seldom mentioned, seldom reached awareness, is therefore seldom explicitly repented - and my impression is that many apparently-devout Christians (in high esteem among their peers) are in fact living-the-lie to such an extent as to invalidate their faith.
Such is the nature of these times. In our era, unrepented sins cannot be held in check - held constant; but (under the pressure of our culture) rapidly get amplified to overwhelming levels.
A modern Christian 'examination of conscience' would do well to highlight the problem of dishonesty - because this is likely to be neglected and unnoticed; and dishonesty is one of those sins that acts as procurer and facilitator for all other sins.
Start with dishonesty and you will soon end-up with all-the-rest.
Every lie, every failure to be honest, is an act of homage to the devil.