Brother Mackey examines the importance of having a temple within the realm of Freemasonry, with specific attention being paid to the symbolism of King Solomon's temple and the working tools a mason uses when building. He also covers the symbolism behind those tools. He compares the physical temple with the spiritual temple of man, which every mason is attempting to erect. He discusses the trestle-board as well as the rough and perfect ashlars and the ancient mysteries.