The phrase is taken from Leviticus, whose source is far earlier than 300 years before Christ walked the earth as a man.
Leviticus 19:18 Thou shalt not avenge, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I am the LORD.
He was quoting from the Torah with both commandments. I mean, that was the whole question He was answering "which commandment in the Law (Torah) is greatest?" I don't think he would answer with something that wasn't even in the Law.
Localism is for people who can still sleep at night even though somebody they don't know in a city they have never been is doing things differently. ("Localism, A Philosophy of Government" on Amazon for Kindle or Barnes and Noble ebook websites)
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