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Reading the earlier ones there in Itivuttaka: The Group of Ones, you can see things like,
Abandon one quality, monks, and I guarantee you non-return. Which one quality? Abandon greed as the one quality, and I guarantee you non-return.
Next it says,
Abandon one quality, monks, and I guarantee you non-return. Which one quality? Abandon aversion as the one quality, and I guarantee you non-return.
And,
Abandon one quality, monks, and I guarantee you non-return. Which one quality? Abandon delusion as the one quality, and I guarantee you non-return
This is referring to the three poisons which are shown as being at the centre of the 'wheel of life'. My understanding, from the way they're represented/illustrated, is that they cause or feed each other.
Wikipedia claims that ignorance is the root cause:
Of these three, ignorance is the root poison. From ignorance, attachment and aversion arise.
Whether or not it is the "root" cause, the implication of the suttas above is that if/when you can eradicate any one of them then you can break the chain or cycle.
The corollary though, IMO, is that if a person indulges in or abides in any one, then they cause them all.
The second noble truth explicitly warns against greed, but the 'three poisons' also warn against anger and ignorance.
And it seems to me that lying is (except in vanishingly rare circumstances) intended to promote ignorance. A person who thinks they can lie successfully might think that they can 'get away with murder'.
You ask, "Is it exaggerated?" IMO 'not lying' is also connected with Right Speech, with being able to share (true) Dharma, with not causing schism in the Sangha.
Upvote:1
A lie is directly supporting ignorance. And an ignorance is directly supporting all defilements (it's present in all of them), which directly supporting all type of evil deeds.
It's usual that weight of deeds is greatly misperceived by common people in compare to Buddha. Mental deeds are most important in consequences. And deliberate lie, probably, does most damage to a mind.
It's said that Bodhisatta in previous lives could do all evil, except lie.
In certain cases a Bodhisatta may destroy life, take what is not given him, commit adultery, drink strong drink, but he may not tell a lie, attended by deception that violates the reality of things. (Harita-jataka, JA 431).
Upvote:2
For most of human history your word truely was your bond.. It was everything, and to lie was to put the reputation of your house, your family, and yourself in danger to the point where you became an outcast or worse.
These days things are different in many ways, our words are not necessarily connected to our social and physical survival, but they are still important. When trust is lost it is not so easily gained back.
So do i believe anyone who lies will also kill people and do horrible things? Most likely not, but deliberate lieing is a dangerous thing that is unskillful and not beneficial to yourself or others. It puts us back along the path and is to be avoided at all costs.
Upvote:5
According to my current teacher, good character is an important prerequisite for Enlightenment. Key qualities of good character are:
Responsibility depends on Integrity. Integrity depends on Honesty. If there is no Honesty, there is no Integrity. The person without Integrity can do anything if it is in their interest, they can't be trusted.
A person who tells lies deliberately has a corrupted value system. If they went as far as to warp reality to cover up their fault or to advance their case, there is no guarantee whatsoever as to what they may do under pressure. Hence "there is no evil deed that is not to be done".