Knowledge as eyes
Concepts of eyes as symbols of knowledge.
Key passages
Zec 3:9

For consider, the stone that I set before Joshua, on one stone are seven eyes. Look, I am going to engrave an inscription on it,’ declares Yahweh of hosts, ‘and I will remove the guilt of that land in a single day.

Zec 4:10

For whoever has despised the day of small things will rejoice and will see the plumb line in the hand of Zerubbabel.” These seven are the eyes of Yahweh which are ranging throughout the whole earth.