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 1 in Psalm 25, he asks for further understanding of God’s path. In Psalm 119, David writes emphatically “I hate every wrong path,” that is, ways that deviate from the ways of God. Not only will a righteous man ignore the advice of the wicked, he studies the law of the Lord every day for guidance and understanding. In Psalm 119, David refers to the word of the Lord as a light revealing the path of life. He is happy studying the law. The righteous man is compared to a tree planted by a stream. His harvest is plentiful, and whatever