Angels are personal spiritual beings who have intelligence, emotions, and will.  This is true of both the good and evil angels (demons). Angels possess  intelligence (Matthew  8:29; 2  Corinthians 11:3; 1 Peter  1:12), show emotion (Luke 2:13; James 2:19; Revelation 12:17), and  exercise will (Luke  8:28-31; 2 Timothy  2:26; Jude 6). Angels  are spirit beings (Hebrews  1:14) without true physical bodies. Although they do not have physical  bodies, they are still personalities.

Because they are created beings,  their knowledge is limited. This means they do not know all things as God does  (Matthew  24:36). They do seem to have greater knowledge than humans, however, which  may be due to three things. First, angels were created as an order of creatures  higher than humans. Therefore, they innately possess greater knowledge. Second,  angels study the Bible and the world more thoroughly than humans do and gain  knowledge from it (James 2:19Revelation  12:12). Third, angels gain knowledge through long observation of human  activities. Unlike humans, angels do not have to study the past; they have  experienced it. Therefore, they know how others have acted and reacted in  situations and can predict with a greater degree of accuracy how we may act in  similar circumstances.

Though they have wills, angels, like all  creatures, are subject to the will of God. Good angels are sent by God to help  believers (Hebrews  1:14). Here are some activities the Bible ascribes to angels:

They  praise God (Psalm  148:1-2; Isaiah 6:3).  They worship God (Hebrews 1:6Revelation  5:8-13). They rejoice in what God does (Job 38:6-7).  They serve God (Psalm  103:20; Revelation  22:9). They appear before God (Job 1:6; 2:1). They are instruments of  God’s judgments (Revelation  7:1; 8:2).  They bring answers to prayer (Acts  12:5-10). They aid in winning people to Christ (Acts 8:26; 10:3). They observe Christian  order, work, and suffering (1  Corinthians 4:9; 11:10; Ephesians  3:10; 1 Peter  1:12). They encourage in times of danger (Acts  27:23-24). They care for the righteous at the time of death (Luke 16:22).

Angels are an entirely different  order of being than humans. Human beings do not become angels after they die.  Angels will never become, and never were, human beings. God created the angels,  just as He created humanity. The Bible nowhere states that angels are created in  the image and likeness of God, as humans are (Genesis  1:26). Angels are spiritual beings that can, to a certain degree, take on  physical form. Humans are primarily physical beings, but with a spiritual  aspect. The greatest thing we can learn from the holy angels is their instant,  unquestioning obedience to God’s commands.