From David

"From David we learn that the Lord does not look on the tall or attractive, no, he has rejected them. The Lord looks instead on the youngest of the brothers, he who tends to what is insignificant. David tended to a few sheep in the wilderness, did not push his way to the "front" but was moved a step at a time by God. He used the very same tools from his wilderness years to fight a giant that everybody else was afraid of." 

                                    - Joel Howard