In the scriptures we have many examples of prophets following the promptings of the Holy Spirit, often not knowing why they are being prompted. Servants of God learn to recognize and follow the promptings of the Holy Ghost, and those with experience do so instantly. The Prophet of The Church of Jesus Christ of Latter-day Saints is one. Prophet Thomas Monson related this experience:
One day a few years ago, after taking care of matters at the office, I felt a strong impression to visit an aged widow who was a patient at a senior care center in Salt Lake City. I drove there directly.
When I went to her room, I found it empty. I asked an attendant concerning her whereabouts and was directed to a lounge area. There I found this sweet widow visiting with her sister and another friend. We had a pleasant conversation together.
As we were talking, a man came to the door of the room to obtain a can of soda from the vending machine. He glanced at me and said, “Why, you are Tom Monson.”
“Yes,” I replied. “And you look like a Hemingway.”
He acknowledged that he was Stephen Hemingway, the son of Alfred Eugene Hemingway, who had served as my counselor when I was a bishop many years ago and whom I called Gene. Stephen told me that his father was there in the same facility and was near death. Gene had been calling my name, and the family had wanted to contact me but had been unable to find a telephone number for me.
I excused myself immediately and went with Stephen up to the room of my former counselor, where others of his children were also gathered, his wife having passed away some years previous. The family members regarded my meeting Stephen in the lounge area as a response by our Heavenly Father to their great desire that I would see their father before he died and answer his call. I also felt that this was the case, for if Stephen had not entered the room in which I was visiting at precisely the time he did, I would not have known that Gene was even in that facility.
We gave a blessing to him. A spirit of peace prevailed. We had a lovely visit, after which I left.
The following morning a phone call revealed that Gene Hemingway had passed away—just 20 minutes after he had received the blessing from his son and me. 
Following the promptings of the Holy Spirit has enabled Prophet Thomas S. Monson to offer a lifetime of service to the Lord Jesus Christ.
The article in which this experience was recounted is called “Peace, Be Still,” and it is meant to demonstrate that the Lord is mindful of us every minute of our lives. He knows us—every thought and molecule. He usually blesses us through His servants, whom He prompts to bring us comfort through the Holy Ghost. In this case, He sent a message through the Holy Ghost to President Monson, in order to bless the life of his old friend as he passed from mortality.
The Holy Ghost is sometimes called the Comforter, and he can offer us peace in the most trying of circumstances—Gene Hemingway’s family was blessed with peace at their loved one’s passing through this experience. They were assured and comforted by God’s tender mercies specific to their trial and at the moment they needed them.
In some cases, instead of prompting one of God’s servants to minister to our needs, the Savior, through the Holy Ghost, does it Himself. In the same article is a story of a girl who lost her brother to death. On the anniversary of his passing, she nearly suffocated with grief. She called upon the Savior in mighty prayer. She longed for comfort.
I asked my Father in Heaven to please heal my heart. The pain was too much for me to deal with alone. Then a feeling of peace, comfort, and love swept over my entire body. I felt as though God had wrapped His arms around me and was protecting me from the intense pain I had felt. I still missed my brother, but I was able to see with different eyes. There was so much for me to learn from this experience. I know the Lord’s love and peace are available. We need only to partake.