Deuteronomy 29:19

19 When such a person hears the words of this oath and they invoke a blessing on themselves, thinking, “I will be safe, even though I persist in going my own way,” they will bring disaster on the watered land as well as the dry.

Read Deuteronomy 29:19 Using Other Translations

And it come to pass, when he heareth the words of this curse, that he bless himself in his heart, saying, I shall have peace, though I walk in the imagination of mine heart, to add drunkenness to thirst:
one who, when he hears the words of this sworn covenant, blesses himself in his heart, saying, 'I shall be safe, though I walk in the stubbornness of my heart.' This will lead to the sweeping away of moist and dry alike.
“Those who hear the warnings of this curse should not congratulate themselves, thinking, ‘I am safe, even though I am following the desires of my own stubborn heart.’ This would lead to utter ruin!

What does Deuteronomy 29:19 mean?

John Gill's Exposition of the Bible
Deuteronomy 29:19

And it cometh to pass, when he heareth the words of this
That is, the man before compared to a root bearing bitter herbs, when he should hear the curses pronounced by the law against such persons as himself:

that he bless himself in his heart;
inwardly pronounce himself blessed, thinking himself secure from the curse of the law, and flattering himself it will never reach him nor come upon him:

saying, I shall have peace;
all happiness and prosperity, in soul, body, and estate; inward peace of mind now, and eternal peace hereafter:

though I walk in the imagination of my heart;
in worshipping idols which he vainly and wickedly imagined to be gods; to the worship of which his wicked heart prompted him, and he was resolutely and stubbornly bent upon, and in which he continued:

to add drunkenness to thirst;
as a thirsty man to quench his thirst drinks, and adds to that, or drinks yet more and more until he is drunken; so a man inclined to idolatry, that has a secret desire after it, thirsts after such stolen or forbidden waters, and drinks of them, adds thereunto, drinks again and again until he is drunk with the wine of fornication, or idolatry, as it is called ( Revelation 17:2 ) ; so the Targums of Onkelos and Jonathan understand the words of adding sin to sin, particularly of adding sins of ignorance to pride, or to presumptuous ones. Wicked men, deceivers and deceived, always grow worse and worse, increasing to more ungodliness, and yet promise themselves peace and impunity, ( 1 Thessalonians 5:3 ) .

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