In the New Testament James carries on this idea when he says, “Draw near to God and he will draw near to you. Cleanse your hands, you sinners, and purify your hearts, you men of double mind.” (James 4:8), While the description from Psalm show that a person with a pure heart has no divided allegiance and no deception in its action, this description in James affirms that men with impure hearts are double minded. It means they have two desires at the same time and therefore creates instability in all that a person does.
A double minded person has a mixture of motives that war against each other. One is to be friends to God and live for the kingdom. The other motive is to be friends of the sinful world and live for himself. This mixture of desires and the ensuing conflict of our sinful hearts are seen throughout Scripture. The apostle Paul observed the truth that when he desired to do what was right, evil laid close at hand (Romans 7). King David understood the condition of his own heart when he cried out in prayer, “Create in me a clean heart Oh Go, and renew a right spirit in me.” (Psalm 51:10)
So it is with us! To be biblically pure means to not be double minded and tossed back and forth between two desires. To be pure means that your heart’s sincere devotion is set to one motive in it actions…that is to honor, praise and glorify God.