Job 28:21

It hath been hid from the eyes of all living. And from the fowl of the heavens It hath been hidden.

Psalm 49:3-4

My mouth speaketh wise things, And the meditations of my heart are things of understanding.

Matthew 11:25

At that time Jesus answering said, 'I do confess to Thee, Father, Lord of the heavens and of the earth, that thou didst hide these things from wise and understanding ones, and didst reveal them to babes.

Matthew 13:17

for verily I say to you, that many prophets and righteous men did desire to see that which ye look on, and they did not see, and to hear that which ye hear, and they did not hear.

Matthew 13:35

that it might be fulfilled that was spoken through the prophet, saying, 'I will open in similes my mouth, I will utter things having been hidden from the foundation of the world.'

1 Corinthians 2:7-10

but we speak the hidden wisdom of God in a secret, that God foreordained before the ages to our glory,

Colossians 2:3

in whom are all the treasures of the wisdom and the knowledge hid,

Treasury of Scripture Knowledge

Summary

Seeing it is hid from the eyes of all living, and kept close from the fowls of the air.

From the fowls

Bible References

Hid

Psalm 49:3
My mouth speaketh wise things, And the meditations of my heart are things of understanding.
Matthew 11:25
At that time Jesus answering said, 'I do confess to Thee, Father, Lord of the heavens and of the earth, that thou didst hide these things from wise and understanding ones, and didst reveal them to babes.
Matthew 13:17
for verily I say to you, that many prophets and righteous men did desire to see that which ye look on, and they did not see, and to hear that which ye hear, and they did not hear.
1 Corinthians 2:7
but we speak the hidden wisdom of God in a secret, that God foreordained before the ages to our glory,
Colossians 2:3
in whom are all the treasures of the wisdom and the knowledge hid,

From the fowls

Job 28:7
A path -- not known it hath a ravenous fowl, Nor scorched it hath an eye of the kite,