The Royal Arch is the culmination of "pure ancient masonry"
The Craft gives its members eminently practical rules by which they can live their lives in the service of both God, however they worship Him, and the community as a whole.
Man, however, is not simply a practical being but has an essential spritual aspect to his nature. This is taken up in the Royal Arch, in which the candidate, without trespassing on the bounds of religion, is led to contemplate the nature of God and his personal relationship with Him.
Thus the Royal Arch leads the candidate from the practical to the spiritual and completes "pure ancient masonry", a fascinating journey of self- knowledge and self - discovery beginning with the Entered Apprentice degree and culminating in the First Principal's chair of the Chapter.