In the investigation of the true meaning of every masonic symbol and allegory, we must be governed by the single principle that the whole design of Freemasonry as a speculative science is the investigation of divine truth. To this great object everything is subsidiary. The Mason is, from the moment of his initiation as an Entered Apprentice, to the time at which he receives the full fruition of masonic light, an investigator--a laborer in the quarry and the temple--whose reward is to be Truth. All the ceremonies and traditions of the order tend to this ultimate design. Is there light to be asked for? It is the intellectual light of wisdom and truth. Is there a word to be sought? That word is the symbol of truth. Is there a loss of something that had been promised? That loss is typical of the failure of man, in the infirmity of his nature, to discover divine truth. Is there a substitute to be appointed for that loss? It is an allegory which teaches us that in this world man can only approximate to the full conception of truth. Hence there is in Speculative Masonry always a progress, symbolized by its peculiar ceremonies of initiation. There is an advancement from a lower to a higher state--from darkness to light--from death to life--from error to truth. The candidate is always ascending; he is never stationary; he never goes back, but each step he takes brings him to some new mental illumination--to the knowledge of some more elevated doctrine. The teaching of the Divine Master is, in respect to this continual progress, the teaching of Masonry--"No man having put his hand to the plough, and looking back, is fit for the kingdom of heaven." And similar to this is the precept of Pythagoras: "When travelling, turn not back, for if you do the Furies will accompany you." Now, this principle of masonic symbolism is apparent in many places in each of the degrees. In that of the Entered Apprentice we find it developed in the theological ladder, which, resting on earth, leans its top upon heaven, thus inculcating the idea of an ascent from a lower to a higher sphere, as the object of masonic labor. In the Master's degree we find it exhibited in its most religious form, in the restoration from death to life--in the change from the obscurity of the grave to the holy of holies of the Divine Presence. In all the degrees we find it presented in the ceremony of circumambulation, in which there is a gradual inquisition, and a passage from an inferior to a superior officer. And lastly, the same symbolic idea is conveyed in the Fellow Craft's degree in the legend of the Winding Stairs. In an investigation of the symbolism of the Winding Stairs we shall be directed to the true explanation by a reference to their origin, their number, the objects which they recall, and their termination, but above all by a consideration of the great design which an ascent upon them was intended to accomplish.