Throughout the Old and New Testaments, the Scriptures help us understand the nature of angels and tell us what angels know and do not know.
Angels are spiritual beings, which allows them to ascend and descend between heaven and earth.
And he dreamed, and behold a ladder set up on the earth, and the top of it reached to heaven: and behold the angels of God ascending and descending on it. (Genesis 28:12) And he saith unto him, Verily, verily, I say unto you, Hereafter ye shall see heaven open, and the angels of God ascending and descending upon the Son of man. (John 1:51)
ANGELS ARE INTELLIGENT AND THEY KNOW WHAT IS HAPPENING ON EARTH.
To fetch about this form of speech hath thy servant Joab done this thing: and my lord is wise, according to the wisdom of an angel of God, to know all things that are in the earth. (2 Samuel 14:20)
ANGELS ARE HIGHER THAN MEN.
What is man, that thou art mindful of him? and the son of man, that thou visitest him? For thou hast made him a little lower than the angels, and hast crowned him with glory and honour. (Psalm 8:4-5)
ANGELS CAN FLY.
And he rode upon a cherub, and did fly: yea, he did fly upon the wings of the wind. (Psalm 18:10)
In the year that king Uzziah died I saw also the Lord sitting upon a throne, high and lifted up, and his train filled the temple. Above it stood the seraphims: each one had six wings; with twain he covered his face, and with twain he covered his feet, and with twain he did fly. (Isaiah 6:1-2)
ANGELS EXCEL IN STRENGTH AND KNOW GOD'S VOICE.
Bless the LORD, ye his angels, that excel in strength, that do his commandments, hearkening unto the voice of his word. (Psalm 103:20)
Who maketh his angels spirits; his ministers a flaming fire. (Psalm 104:4) Are they not all ministering spirits, sent forth to minister for them who shall be heirs of salvation? (Hebrews 1:14)
ANGELS ARE CREATED BEINGS.
Praise ye the LORD. Praise ye the Lord from the heavens: praise him in the heights. Praise ye him, all his angels: praise ye him, all his hosts. Let them praise the name of the LORD: for he commanded, and they were created. (Psalm 148:1-2, 5)
For by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by him, and for him. (Colossians 1:16)
ANGELS CAN MAKE WILLFUL DECISIONS.
How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations! For thou hast said in thine heart, I will ascend into heaven, I will exalt my throne above the stars of God: I will sit also upon the mount of the congregation, in the sides of the north. (Isaiah 14:12-13)
ANGELS SEE THE FACE OF GOD.
Take heed that ye despise not one of these little ones; for I say unto you, That in heaven their angels do always behold the face of my Father which is in heaven. (Matthew 18:10)
ANGELS ARE NOT MARRIED.
For in the resurrection they neither marry, nor are given in marriage, but are as the angels of God in heaven. (Matthew 22:30)
ANGELS DO NOT KNOW WHEN JESUS WILL RETURN.
But of that day and hour knoweth no man, no, not the angels of heaven, but my Father only. (Matthew 24:36) But of that day and that hour knoweth no man, no, not the angels which are in heaven, neither the Son, but the Father. (Mark 13:32)
ANGELS KNEW WHEN JESUS WAS RESURRECTED.
And, behold, there was a great earthquake: for the angel of the Lord descended from heaven, and came and rolled back the stone from the door, and sat upon it. His countenance was like lightning, and his raiment white as snow: and for fear of him the keepers did shake, and became as dead men.
ANGELS ARE HOLY.
Whosoever therefore shall be ashamed of me and of my words in this adulterous and sinful generation; of him also shall the Son of man be ashamed, when he cometh in the glory of his Father with the holy angels. (Mark 8:38)
ANGELS KNEW WHEN CHRIST WAS BORN.
And the angel said unto her, Fear not, Mary: for thou hast found favour with God. And, behold, thou shalt conceive in thy womb, and bring forth a son, and shalt call his name Jesus. He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David. (Luke 1:30-32)
And, lo, the angel of the Lord came upon them, and the glory of the Lord shone round about them: and they were sore afraid. And the angel said unto them, Fear not: for, behold, I bring you good tidings of great joy, which shall be to all people. For unto you is born this day in the city of David a Saviour, which is Christ the Lord. (Luke 2:9-11)
ANGELS ARE GLORIOUS.
For whosoever shall be ashamed of me and of my words, of him shall the Son of man be ashamed, when he shall come in his own glory, and in his Father's, and of the holy angels. (Luke 9:26)
ANGELS KNOW WHEN A PERSON RECEIVES SALVATION.
Likewise, I say unto you, there is joy in the presence of the angels of God over one sinner that repenteth. (Luke 15:10)
ANGELS ARE ETERNAL.
Neither can they die any more: for they are equal unto the angels; and are the children of God, being the children of the resurrection. (Luke 20:36)
ANGELS ARE MIGHTY.
And to you who are troubled rest with us, when the Lord Jesus shall be revealed from heaven with his mighty angels. (2 Thessalonians 1:7)
For verily he took not on him the nature of angels; but he took on him the seed of Abraham. (Hebrews 2:16)
ANGELS ARE TOO NUMEROUS TO COUNT.
But ye are come unto mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels. (Hebrews 12:22)
ANGELS KNOW PEOPLE, HAVE VISITED PEOPLE, AND HAVE BEEN SEEN ON EARTH.
Be not forgetful to entertain strangers: for thereby some have entertained angels unawares. (Hebrews 13:2)
ANGELS ARE UNDER THE AUTHORITY OF JESUS CHRIST.
The like figure whereunto even baptism doth also now save us (not the putting away of the filth of the flesh, but the answer of a good conscience toward God,) by the resurrection of Jesus Christ: Who is gone into heaven, and is on the right hand of God; angels and authorities and powers being made subject unto him. (1 Peter 3:21-22)
ANGELS ARE RADIANT.
And after these things I saw another angel come down from heaven, having great power; and the earth was lightened with his glory. (Revelation 18:1)