Jamieson, Fausset and Brown on 1 Chronicles 17:7

7. Thus saith the Lord of hosts, I took thee from the sheepcote--a round tower of rude construction, high walled, but open at the top, in which sheep are often enclosed at night to protect them from wild beasts. The meaning is, I elevated you to the throne from a humble condition solely by an act of divine grace, and not from any antecedent merits of your own (see on 1Sa 16:11), and I enabled you to acquire renown, equal or superior to any other monarch. Your reign will ever be afterwards regarded as the best and brightest era in the history of Israel, for it will secure to the nation a settled inheritance of prosperity and peace, without any of the oppressions or disorders that afflicted them in early times.