Noun
The Eye of Providence, a symbol of an eye usually enclosed in a triangle, representing the eye of God.
(by synecdoche) The omniscient God.
Source: en.wiktionary.orgThe all-seeing eye of God beheld our deplorable state; infinite pity touched the heart of the Father of mercies; and infinite wisdom laid the plan of our recovery. David Brainerd
Some of the worst tyrannies of our day genuinely are "vowed" to the service of mankind, yet can function only by pitting neighbor against neighbor. The all-seeing eye of a totalitarian regime is usually the watchful eye of the next-door neighbor. Eric Hoffer