Nothing escapes His notice!

(Arthur Pink, "The Attributes of God")

What a wondrous Being is the God of Scripture!

"Nothing in all creation is hidden from God's sight.
 Everything is uncovered and laid bare before the
 eyes of Him to whom we must give account."
    Hebrews 4:13

God is omniscient.
He knows everything:
  everything possible,
  everything actual,
  all events,
  all creatures,
  of the past, the present, and the future.

He is perfectly acquainted with every detail in the
life of every being in heaven, in earth, and in hell.
Nothing escapes His notice
, nothing can be
hidden from Him, nothing is forgotten by Him.
His knowledge is perfect.

He never errs.
He never changes.
He never overlooks anything.

God not only knows whatever has happened in the past
in every part of His vast domains; and He is not only
thoroughly acquainted with everything that is now
transpiring throughout the entire universe—but He is
also perfectly cognizant of every event, from the least
to the greatest, that ever will happen in the ages to
come! God's knowledge of the future is as complete
as is His knowledge of the past and the present; and
that, because the future depends entirely upon Himself.
God has Himself designed whatever shall yet be, and
what He has designed, must be effectuated. God's
knowledge does not arise from things because they
are or will be—but because He has ordained them to
be! Yes, such is the God with whom we have to do!

"You know when I sit and when I rise; You perceive my
 thoughts from afar. You discern my going out and my
 lying down; You are familiar with all my ways. Before a
 word is on my tongue—You know it completely, O Lord!"
     Psalm 139:2-4

How solemn is this fact: nothing can be concealed from
God! "For I know the things that come into your mind,
every one of them" (Ezekiel 11:5). Though He is invisible
to us—we are not so to Him. Neither the darkness of night,
the closest curtains, nor the deepest dungeon—can hide
any sinner from the eyes of Omniscience! Men would strip
Deity of His omniscience if they could. They wish there
might be . . .
  no Witness of their sins,
  no Searcher of their hearts,
  no Judge of their deeds!