Bible Verses About Heart: The Unregenerate is Double (Duplicity)

Of Zebulun, such as went forth to battle, expert in war, with all instruments of war, fifty thousand, which could keep rank: they were not of double heart.

They speak vanity every one with his neighbour: with flattering lips and with a double heart do they speak.

Happy is the man that feareth alway: but he that hardeneth his heart shall fall into mischief.

And all the people shall know, even Ephraim and the inhabitant of Samaria, that say in the pride and stoutness of heart,

Wherefore it shall come to pass, that when the Lord hath performed his whole work upon mount Zion and on Jerusalem, I will punish the fruit of the stout heart of the king of Assyria, and the glory of his high looks.

Hearken unto me, ye stouthearted, that are far from righteousness:

Their heart is divided; now shall they be found faulty: he shall break down their altars, he shall spoil their images.

But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed.

A double minded man is unstable in all his ways.