All men are liars; no man can tame the tongue

Psalm 116:11 KJV
I said in my haste, All men are liars.

James 3:8 KJV
But the tongue can no man tame; it is an unruly evil, full of deadly poison.​

Do these give permission for the saint, who is a man, to abound in iniquity in the tongue? If all men are liars, and if I, being a man, cannot tame the tongue, why bother fighting against inevitability?

I have thought, that proverbs 21:8 gives us an insight into these verses, as a key fits nicely into its proper designation to unlock perplexity.

KJV
The way of man is froward and strange: but as for the pure, his work is right.​

The proverb distinguishes between the man, and the pure.

And so, this leaves us with the possibility that the pure are free from such iniquity.

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1 Timothy 1 NASB, bold emphasis mine
5 But the goal of our instruction is love from a pure heart and a good conscience and a sincere faith.​