I don't think quoting bits of scripture is a straightforward thing at all. An isolated Jesus quote like Matthew 5:17-18 might convey the impression that Christians implement all of the same commandments as Jews do. Context matters, even very wide context, as @Thomas keeps pointing out, rightly in my opinion. Your quote from Baha'u'llah is a very noble statement, and I like the general tenor. But it is very, very general. Is is it descriptive, as in "we're all in this together" - or prescriptive? Should we strive to unite all countries in the world politically? Is that what you mean by unity? Or are structures such as the UN more in the spirit of the unity of mankind? Also, should politics be informed by religious views, would this be conducive to unity or rather to violent division, as countless such experiments in the past have shown? So to answer your question, I suspect I read this passage very differently from you.