Do good to those who hate you. God prepares the world for us, tells us where the land mines are, prepares the table before us in the presence of our enemies. You anoint my head with oil, my cup overflows. The shepherd was also the veterinarian. No matter how careful the shepherd was, the sheep would still do dumb things and get hurt.
Sheep are also skittish animals.
In times of great stress he gave them a curative drink made from fermented materials and herbs sweetened with honey, a tranquilizer that calmed them down. To say that God anoints our head with oil, and then our cup overflows is to say that this is a God who prepares the world for us and when we still do dumb things and get hurt, this God heals us on the outside and also heals us on the inside. The Lord is my shepherd, I shall not want. He leads me in right paths for his name's sake. Surely goodness and mercy shall follow me all the days of my life, and I shall dwell in the house of the Lord my whole life long .