36:6 Christ's ministers are the spiritual guardians of the people entrusted to their care. Their work has been likened to that of watchmen. In ancient times sentinels were often stationed on the walls of cities, where, from points of vantage, they could overlook important posts to be guarded, and give warning of the approach of an enemy. Upon their faithfulness depended the safety of all within. At stated intervals they were required to call to one another, to make sure that all were awake and that no harm had befallen any. The cry of good cheer or of warning was borne from one to another, each repeating the call till it echoed round the city.