"nothing would be more absurd than to interpret every image of [the externally multifarious and internally complex pagan and especially 'Christian'] labyrinth . . . as the manifestation of but a single sense. The intention behind every single [(jeder einzelne)] employment of the figure . . . must be groped after differentially [(differenzierend . . . ertastet)]. . . ."
Wolfgang Haubrichs, "Error inextricabilis: Form und Funktion der Labyrinthabbildung in mittelalterlichen Handschriften," in Text und Bild: Aspekte des Zusammenwirkens zweier Künst in Mittelalter und früher Neuzeit, hrsg. Christel Meier und Uwe Ruberg (Wiesbaden: Reichert, 1980), 158 (63-174), translation and underscoring mine. Needless to say, I have yet to read (all 112 pages of) this impressive-looking article as a whole.
"Little can be said with certainty about the function and significance of church labyrinths. Most accounts, for example, of labyrinths having served as paths of repentance and as symbolic pilgrimages are only hearsay and must be very late, possibly from the 18th century. Despite this, I shall endeavor to present several possible interpretations" [tied to some of the different historical exemplars]. . . . And so, on "The path to Jerusalem" interpretation, "Several northern French pavement labyrinths were referred to as the 'Chemin du Jérusalem,' the path to Jerusalem. We do not know how old this designation is; I do not know of any sources that date further back than the 18th century. This relatively recent appellation is probably just as uncharacteristic of the labyrinth as is the speculation that surrounds it: that such labyrinths are from the time of the Crusades and offered those who remained behind—those for whom a pilgrimage to the Holy Land was not possible—a substitute pilgrimage of a penitential nature. . . .
"We can take our cue as to how seriously to take such speculations about the labyrinth being a substitute pilgrimage to the actual city of Jerusalem from a map of Lille, where, also in the mid-19th century, a route for pilgrimages was planned."
Hermann Kern, Through the labyrinth: designs and meanings over 5,000 years (Munich: Prestel, 2000), 146, 148. Regarding that map of Lille included in the prize-winning but unused 1856 plan by Clutton and Burges for the design of the Cathedral of Notre-Dame-de-la-Treille in Lille, see p. 155: "Representations of the cities pilgrims would have travelled through on the 'Path to Jerusalem' appear in the spandrels: Lille as the starting point, Rome, Constantinople, and, lastly, Jerusalem. The design was a Neo-Gothic version of an only slightly older idea, taken literally, and thus deprived of its spiritual character and given a practical, geographical slant as a manual for pilgrims" (with sources).