J. Douglas MacMillan has been held at that institution in his honour. According to Hywel Jones, MacMillan's preaching was marked by "powerful originality and strong orthodoxy". He is best known for his book "The Lord Our Shepherd" (). This is an exposition of Psalm 23, originally given to the Evangelical Movement of Wales in 1979. MacMillan drew on his 12 years of experience as a shepherd to argue that the shepherd theme pervades the entire psalm. MacMillan wrote a number of other books including "Wrestling with God" () consisting of addresses on the life of Jacob given to the Evangelical Movement of Wales
Psalm 143 currently the fourth Thursday prayed at Lauds in the Liturgy of the Hours and every Tuesday night at compline. This psalm is a prayer request. The Psalmist's cry is divided into four stages: the psalmist is sorry and is not better than another; it is at an impasse; but he sees that the Lord has saved other men; so he puts his trust in the Lord. The psalm evokes the problem of a prayer request from the sinner, the one that persecutes the enemy. The solid base that helps the psalmist hope in the LORD is his reminiscence of the