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 116 psalm is one of the so called Egyptian Hillel prayers. It is a question of the praise of the Lord by all peoples. The second verse expresses the reason for the first verse: the goodness of the Lord has been experienced in the past, and his faithfulness will last forever. If we take into consideration the whole book of psalms, we see that this psalm comes to sum up and conclude all the psalms of the hallel, and even all the preceding psalms since Psalm 107, for they invite Israel and all nations to praise 'Eternal. Theodoret applies this psalm