The Deeper Symbolism of Freemasonry from The Meaning of Masonry by Walter Leslie Wilmshurst.

“Here again the symbolism of our work becomes extremely profound and interesting. He who desires to rise to the heights of his own being must first crush and crucify his own lower nature and inclinations; he must perforce tread what elsewhere is described as the way of the Cross; and that Cross is indicated by the conjunction of those working tools (which when united form a cross); and that ‘way’ is involved in the scrupulous performance of all that we know those working tools signify.” [via]