This phrase reminds us that the Lord doesn't change, his plans don't change, his gospel doesn't change, his purposes cannot be frustrated (DC 3:1). His work is so filled with unity and conformity that it is described as one eternal round. Moroni said, For do we not read that God is the same yesterday, today, and forever, and in him there is no variableness neither shadow of changing? (Mormon 9:9). The Lord's couse is "round" because the cycle repeats itself over and over again. Neal A. Maxwell said, "there is, in fact, divine delight in that 'one eternal round' which, to us, seems to be all routine and repetition. God derives His great and continuing joy and glory by increasing and advancing His creations, and not from new intellectual experiences." (All These Things Shall Give Thee Experience, p. 14).
Elder Rudger Clawson
'…God's work is everlasting, and with Him it is one eternal round. He uses the words 'firstly' and 'lastly,' in order that we by our finite minds may be able to understand: but to Him there is no beginning of his works; there is no end to them. It is a beautiful thought, isn't it? It gives you the idea at once of eternal life, something that continues and never ends. It is a tremendous thought, and quite beyond our comprehension. There is no man in this room, there is no woman in this assembly, that can comprehend, can begin to grasp the idea of eternal life. We can feel it. We just feel it in our very bones. We feel that we are destined to live forever. We feel that, but we cannot explain it." (Conference Report, p. 54)