because he is double-minded and undecided in all that he does [i.e., he cannot make up his mind and follow through about anything].

Draw near to God, and he will draw near to you. Cleanse your hands, you sinners; and purify your hearts, you double-minded.

Is any man among you under afflictions? let him pray. Is any man happy in mind? let him sing psalms.

Is there not a division in your minds? have you not become judges with evil thoughts?

But he gives all the greater blessing. As the Scripture says, "God opposes haughty persons, but he blesses humble-minded ones."

for you surely know that what is genuine in your faith produces the patient mind that endures;

Such a man, indeed, a person with two minds,

But if any one among you thinks he is religious, and bridles not his tongue, but deceives his mind, that man's religion is vain.