President Wilford Woodruff made this statement in the general conference October 10, 1900:
“After the death of Joseph Smith, I saw and conversed with him many times in my dreams in the night season.
On one occasion he and his brother Hyrum met me when on the sea going on a mission to England. I had Dan Jones with me. He received his mission from Joseph Smith before his death; and the prophet talked freely to me about the mission I was then going to perform. And he also talked to me with regard to the mission of the Twelve Apostles in the flesh, and he laid before me the work they had to perform; and he also spoke of the reward they would receive after death. And there were many other things he laid before me in his interview on that occasion.
And when I awoke many of the things he had told me were taken from me, I could not comprehend them. I have had many interview with Brother Joseph until the last fifteen or twenty years of my life; I have not seen him for that length of time.
But during my travels in the southern country last winter I had many interviews with President Young, and with Heber C. Kimball, and George A. Smith, and Jedediah M. Grant, and many others who are dead. They attended our conference, they attended our meetings. And on one occasion, I saw Brother Brigham and Brother Heber ride in a carriage ahead of the carriage in which I rode when I was on my way to attend conference; and they were dressed in the most priestly robes.
When we arrived at our destination I asked asked President Young if he would preach to us. He said "No, I have finished my testimony in the flesh, I shall not talk to this people any more. But (said he) I have come to see you; I have come to watch over you, and see what people are doing. Then (said he)I want you to teach the people- and I want you to follow this counsel yourself- that they must labor and so live as to obtain the Holy Spirit, for without this you cannot build up the kingdom: without the spirit of God you are in danger of walking in the dark, and in danger of failing to accomplish your calling as apostles and as elders in the Church and Kingdom of God. And, said he, Brother Joseph taught me this principle."
And I will here say, that I have heard him refer to that while he was living. But what I was going to say is this: The thought came to me that Brother Joseph had left the work of watching over this Church and Kingdom to others, and that he had gone ahead, and that he had left this work to men who have lived and labored with us since he left us. This idea manifested itself to me, that such men advance in the spirit world. And I believe myself that these men who have died and gone into the spirit world had this mission left with them, that is, a certain portion of them, to watch over the Latter-day Saints.”
Wilford Woodruff gave us a glimpse of what it is like to see with "Spiritual eyes." President Woodruff shared that the Prophet Joseph Smith spoke to him on multiple occasions, teaching Wilford of what is needed to be accomplished. After the Prophet Brigham Young passed away, he also taught Brigham Young from beyond the grave. This story demonstrates the connection to the people who were once here, but have now passed on are still near. The work of God has an impact on both sides of the veil, and the Lord will give us the experiences we need to get His work accomplished. This quote is from the book "Faith Precedes the Miracle" and President Spencer W. Kimball, speaking of this quote said: "From this powerful quote of Wilford Woodruff we can draw the conclusion that the angels watching over the people on Earth, are angels that are close to the people living on the Earth. President Woodruff said that some of the spirits, who have moved on, are given the assignment to watch over the Church and those same spirits are those who once labored with us."
Elder James E. Talmage said “Because of God’s “‘great love, He has set heavenly beings to watch over us and to guard us from the attacks of evil powers while we live on earth. Do we realize that in our daily walk and work we are not alone, but that angels attend us wherever our duty causes us to go?”
References:
"Faith Precedes the Miracle" Spencer W. Kimball p. 25
James E. Talmage quote Millennial Star 55 (July 10, 1893): 446; see also Stuy, Collected Discourses, 3:291.