Pastors are built under shouldering a people who the Lord has set upon them. Many preachers and students for the ministry need to work among the people or a people after the Lord has put His call and gift in Him. In this, the Lord reveals through association the "people affection" that is a must for the shepherd for his flock. "Hired" shepherds are not recommended by the Lord. (John 10)
Hence, true shepherds are built under carrying a people upon their hearts. True love grows of this, as true love grows into marriage.