The single stone set before Joshua is the pineal gland, and the 7 eyes upon it are the completed range of inner perception, since the number 7 means completion; the full set of centers opens as one sight rather than as scattered separate glances. The higher mind engraves this stone, cutting the pattern of awakened seeing into the one gland where all perception gathers.
Removing the iniquity of the land in a single day is the mind cleared in one stroke of realization: when the stone bearing the 7 eyes is engraved, the flaw in the field of consciousness lifts at once. All inner sight rests on one center, and its opening ends the disorder of the mind.
Stone: the pineal gland, the one center where all inner perception gathers
7 eyes: the completed range of inner sight, perception made whole upon the single gland
The LORD of hosts: the higher mind that engraves the pattern of awakened seeing
Land: the field of consciousness whose flaw is cleared in a single stroke