By practical Christianity foundation, (PCF)
David was appointed and anointed by God to be the king of Israel following Saul. There was one consistent factor on the human level which firmly established David's kingdom. when the chief princes and men of war from each tribe came to confess their allegiance to David, he would not accept them until they declared that they were of one mind and undivided heart. David realized that, unless the nation is single-minded and its citizens are united in their hearts, the kingdom would not be well-founded. So, is our heart united with our Savior? Are we one in Christ in mind and in heart?