pretty sure he's referring to 1John4:20.
If a man say, I love God, and hateth his brother, he is a liar: for he that loveth not his brother whom he hath seen, how can he love God whom he hath not seen?
Although, I think John is referring to Christians when he says "his brother" yet; I definitely think there is an element of "brotherhood" among your kinsman and countrymen, it's just not as strong.
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With respect to nationalism, Paul (I think) explains that God divided the world into nations "that they might seek after him", so even though there is not a lot of explanation behind it, we know that's part of God's plan of reconciliation. And we know from Romans that, the power of government comes from God. We are supposed to pray for our nation, and it's rulers, and we are supposed to submit to government to the extent that it's not asking something immoral of us. I think we owe fealty and fidelity and in return we should get, to some extent, faithful governance- if not faithful to God, at least faithful toward Godly principles, or... at least some principles. Of course our faith should always be in God- and never in the actual government itself.
Biblically, when John the Baptist was preaching the kingdom of heaven, some men that were already soldiers asked John what they should do:
Then some soldiers asked him, “And what should we do?” He replied, “Don’t extort money and don’t accuse people falsely—be content with your pay.”
Basically, "don't abuse your power". He didn't tell them they had to stop being soldiers or serving the government in order to be right with God.
But whether or not you ought to do it, that's between you and the Lord.
If a man say, I love God, and hateth his brother, he is a liar: for he that loveth not his brother whom he hath seen, how can he love God whom he hath not seen?
Although, I think John is referring to Christians when he says "his brother" yet; I definitely think there is an element of "brotherhood" among your kinsman and countrymen, it's just not as strong.
___________________________________________________________________________________________________________________
With respect to nationalism, Paul (I think) explains that God divided the world into nations "that they might seek after him", so even though there is not a lot of explanation behind it, we know that's part of God's plan of reconciliation. And we know from Romans that, the power of government comes from God. We are supposed to pray for our nation, and it's rulers, and we are supposed to submit to government to the extent that it's not asking something immoral of us. I think we owe fealty and fidelity and in return we should get, to some extent, faithful governance- if not faithful to God, at least faithful toward Godly principles, or... at least some principles. Of course our faith should always be in God- and never in the actual government itself.
Biblically, when John the Baptist was preaching the kingdom of heaven, some men that were already soldiers asked John what they should do:
Then some soldiers asked him, “And what should we do?” He replied, “Don’t extort money and don’t accuse people falsely—be content with your pay.”
Basically, "don't abuse your power". He didn't tell them they had to stop being soldiers or serving the government in order to be right with God.
But whether or not you ought to do it, that's between you and the Lord.