All 7 Uses of

labyrinth
in
This Side of Paradise

Amory was alone—he had escaped from a small enclosure into a great labyrinth.†
Chpt 2.5 *

Amory said to himself that there were essentially two sorts of people who through natural clarity or disillusion left the enclosure and sought the labyrinth.†
Chpt 2.5

There were men like Wells and Plato, who had, half unconsciously, a strange, hidden orthodoxy, who would accept for themselves only what could be accepted for all men—incurable romanticists who never, for all their efforts, could enter the labyrinth as stark souls; there were on the other hand sword-like pioneering personalities, Samuel Butler, Renan, Voltaire, who progressed much slower, yet eventually much further, not in the direct pessimistic line of speculative philosophy but concerned in the eternal attempt to attach a positive value to life.... Amory stopped.†
Chpt 2.5

Life was a damned muddle...a football game with every one off-side and the referee gotten rid of—every one claiming the referee would have been on his side.... Progress was a labyrinth...people plunging blindly in and then rushing wildly back, shouting that they had found it...the invisible king—the elan vital—the principle of evolution...writing a book, starting a war, founding a school.... Amory, even had he not been a selfish man, would have started all inquiries with himself.†
Chpt 2.5

In self-reproach and loneliness and disillusion he came to the entrance of the labyrinth.†
Chpt 2.5

Of Amory's attempted sacrifice had been born merely the full realization of his disillusion, but of Monsignor's funeral was born the romantic elf who was to enter the labyrinth with him.†
Chpt 2.5

He saw the two pictures together with somewhat the same primitive exaltation—two games he had played, differing in quality of acerbity, linked in a way that differed them from Rosalind or the subject of labyrinths which were, after all, the business of life.†
Chpt 2.5

Definitions:

(1) (labyrinth)
a maze (a complex system of paths or tunnels in which it is easy to get lost)

or (figuratively): anything so complicated that it is extremely confusing

The word "labyrinth" comes from the name of the maze of passages where, in Greek mythology, Theseus had to escape from the Minotaur.
(2) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Less commonly, labyrinth can refer to a complex anatomical system of interconnecting cavities -- especially the inner ear