וַיֹּ֨אמֶר שְׁמוּאֵ֣ל אֶל־יִשַׁי֮ הֲתַ֣מּוּ הַנְּעָרִים֒ וַיֹּ֗אמֶר ע֚וֹד שָׁאַ֣ר הַקָּטָ֔ן וְהִנֵּ֥ה רֹעֶ֖ה בַּצֹּ֑אן וַיֹּ֨אמֶר שְׁמוּאֵ֤ל אֶל־יִשַׁי֙ שִׁלְחָ֣ה וְקָחֶ֔נּוּ כִּ֥י לֹא־נָסֹ֖ב עַד־בֹּא֥וֹ פֹֽה׃
Então Shmuel perguntou a Yishai: "Acabaram-se os jovens?" E ele respondeu: "Ainda resta o mais novo, que neste momento está apascentando as ovelhas." E Shmuel disse a Yishai: "Mande buscá-lo, pois não descansaremos até que ele venha aqui."
Or HaChaim
Another meaning of this expression may be that Moses trained himself to acquire the virtue of reverence for G'd. He was not blessed with this virtue by birth, it was not one of the genetic gifts he enjoyed. We may understand this better with the help of a statement in the Talmud comparing the respective virtues of King Saul and King David. Rav Hunna (Yuma 22) states that "whereas Saul committed one grievous error which spelled his doom (as a king and dynasty), David committed two errors without paying for it by losing his kingdom and his dynasty." The reason why G'd applied a stricter yardstick when judging Saul's behaviour was that Saul was of a natural disposition which made it easy for him to revere G'd and be obedient. David, on the other hand, had no such genetic advantage and found it much more difficult to discipline himself. This is why he was introduced to us in the Book of Samuel I 16,11 as אדמוני, i.e. similar to Edom, to Esau, in temperament. Had Saul possessed David's temperament he would have become ten times as guilty of disobeying G'd as David was. The Torah testifies here that Moses' attaining of the title איש האלוקים represented a supreme effort by Moses seeing that he was an independent spirit by nature.