The phrase "humble shepherds" refers to simple and modest people who take care of sheep. It conveys the idea of people who are down-to-earth, unassuming, and content with their role and lifestyle. Full definition
Since «the blogito» made the lead quote yesterday on Andrew Sullivan's «Dish,» I have become a household name to millions of persons dispersed throughout the world, from humble shepherds in their huts.... (firstthings.com)
The wisemen's recognition of kingship in a powerless infant, the angels» choice of humble shepherds to whom to announce the news, Jesus» birth as an outcast in a stable — all these point to a very different kind of king, to a power and truth that transcend worldly power and the socially acceptable status quo. (religion-online.org)