Officially, the WTS has poohpoohed the concept of "guardian angels" connecting it with false doctrine in Christendom or new age foolishness. Here is one official take on it. (2 scriptures to search are Psalm 34:7 and Hebrews 1:14)
*** w76 8/15 pp. 494-495 Jehovah, a Helper Without Equal ***
Are Jehovah?s powerful angels still willing and eager to serve in behalf of his people on earth? Most assuredly! When alerting his disciples to the seriousness of stumbling others, Jesus stressed the concern of the angels in the matter: "See to it that you men do not despise one of these little ones; for I tell you that their angels in heaven always behold the face of my Father who is in heaven." (Matt. 18:10) Jesus? words do not necessarily mean that each devoted Christian has a special guardian angel assigned to him. But apparently angels are looking out for the spiritual welfare of true Christians as a whole. This is confirmed in question form at Hebrews 1:14: "Are they not all spirits for public service, sent forth to minister for those who are going to inherit salvation?" What marvelous aid is available to us through the angels!
But then has this experience printed:
*** w70 6/1 pp. 347-348 Desiring to Know My Grand Creator ***
The more I have come to know my Creator, the more confidence I have gained in the protective care he throws around those who serve him from the heart. One must have faith in order to meet successfully many of the experiences encountered in the work of preaching the Kingdom. But Jehovah?s assurance to such is: "The angel of Jehovah is camping all around those fearing him, and he rescues them."?Ps. 34:7.
I vividly recall one experience in which I truly needed faith in this promise. It was in Culpeper County, Virginia. While sitting in my car finishing my lunch and absorbed in reading a copy of The Watchtower, I was suddenly aware of two long arms that reached into the car, one hand near my throat, the other behind my neck, fingers bent ready to clutch at me. Immediately I petitioned Jehovah for his help. The tall man stood motionless.
While maneuvering my neck out of range I kept his mind occupied by telling him that I usually read The Watchtower while eating lunch, that I really enjoyed the article I just read telling about the blessings that Christ?s kingdom would soon bring, conditions in which nothing shall hurt or make afraid. My neck now free, but his arms still inside my car, I turned on the ignition, saying: "I must be going now. Enjoyed talking with you." With that he pulled back, his arms dropped to his sides, and the last that I saw of him in my rearview mirror he still stood there like a stone statue.
I long remembered this experience, but it had the effect of giving me the feeling of closer relationship to the Creator. I knew that God would protect his servants and give them strength to bear up under every evil.
*** w63 1/15 p. 36 Do You Stumble over Imperfection? ***
What if the guardian angels of Jehovah?s earthly people said: ?Jehovah, we cannot associate with these imperfect men and women that you are using on earth to do your will. Either they go or we do??
*** g99 11/22 pp. 6-7 Testing the Stories ***
Among current angel stories, rescue accounts abound. In one best-selling book, we read of a young girl who is gently led from a burning house by an unseen hand. Another book tells of two college students stranded in a blizzard. Suddenly, a truck appears and tows them to safety, yet it leaves no tracks! Elsewhere, another story tells of Ann, who is stricken with cancer. Three days before she is to enter the hospital for surgery, a tall stranger comes to her door. He introduces himself as Thomas and says that he has been sent by God. Thomas holds up his hand, and Ann feels a hot, white light pass through her body. When she arrives for her surgery, the doctors are astounded. Her cancer is gone!
These stories raise an obvious question, If everyone has a guardian angel, why are some people rescued, whereas many are not? Countless millions have died from disease, wars, famines, and natural disasters. Surely, many earnestly prayed for help. Why didn?t a guardian angel save them?
The Bible offers help with this question. It points out that God is not partial. (Acts 10:34) Furthermore, while God?s loyal angels are interested in our physical welfare, they are more interested in our spiritual welfare. The apostle Paul suggested this in question form: "Are [angels] not all spirits for public service, sent forth to minister for those who are going to inherit salvation?" (Hebrews 1:14) Physical help brings temporary benefits, but spiritual help can bring eternal benefits.