I have been reading “ Shepherds after my own heart, pastoral traditions, and leadership in the Bible” by Timothy Laniak. I am just a couple chapters into it, but it is very good so far.
He quotes this moving passage from another author which I have read and reread with tears and admiration: 
“On some high moor, across which at night hyenas howl, when you meet him, sleepless, far-sighted, weather-beaten, armed, leaning on his staff, and looking out over his scattered sheep, every one on his heart, you understand why the shepherd of Judea sprang to the front in his people’s history; why they gave his name to their king, and made him the symbol of Providence; why Christ took him as the type of self-sacrifice.” (G. A. Smith 1966: 210)
Quoted in Timothy Laniak “Shepherds after my own heart” p. 57



