I believe that by lowly we refer to the underpriviledged people..... those who have less in life when it comes to materials things, those that belong to the lower ladder of the society.. Yes they are so valuable to Him because He has reserved a place for them in Heaven.... Blessed are the poor for theirs is the kingdom of heaven.... Jesus is very much concerned for the salvation of the poor... the sinners... those who are wiling to serve those in need without expecting anything in return .. to give up all that they have ...... for the love of Jesus