We are to love the least, because any time there is a "least" in our mind, there's something wrong with our thinking. All are equal before God, and those who are pitied may be our superiors in the eternal world; who's lives were hand-crafted to give us an opportunity to improve our perspective.

 

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On a related not, it is also interesting that it is the "least" or least esteemed among men that He chooses to work through. As a result, his great works of salvation often go unnoticed as if to be an object lesson in itself.