Musar su Salmi 52:4

The second is because the repentance of one involved in evil speech is difficult, since he has taught his tongue to speak falsehood, and sent his mouth to evil. From so much habit, he does not control his spirit, and it is as if his mouth causes the thought - like the matter that is stated (Psalms 52:4), “Your tongue devises mischief”; and it is stated (Ecclesiastes 10:12), “but a fool’s lips will swallow him up”; and it is stated.(Proverbs 18:7), “The fool’s speech is his ruin (mechitah).” And mechitah is an expression of fear and trepidation. It means to say that the fool is afraid and in trepidation from the rage of his tongue, lest he be ensnared - like he fears from his enemy - as his lips are not in his control.