According to LDS, do all non-LDS Christians lack the Gift of the Holy Ghost, and if so, how does this lack manifest itself in the lives of non-LDS?

I just finished reading [Chapter 16: The Gift of the Holy Ghost](https://www.churchofjesuschrist.org/study/manual/doctrines-of-the-gospel-student-manual/16-gift-of-the-holy-ghost) of the LDS book *Doctrines of the Gospel Student Manual*. One section that caught my attention is the following: > “True it is that honest truth seekers come to know of the truth and divinity of the Lord’s work by the power of the Holy Ghost: **they receive a flash of revelation telling them that Jesus is the Lord, that Joseph Smith is his prophet, that the Book of Mormon is the mind and will and voice of the Lord, that The Church of Jesus Christ of Latter-day Saints is the only true and living Church upon the face of the whole earth**. They gain a testimony before baptism. **But it is only after they pledge their all in the cause of Christ that they receive the gift of the Holy Ghost**, which is the heavenly endowment of which Jesus spoke. **Then they receive a fulfillment of the promise**: ‘By the power of the Holy Ghost ye may know the truth of all things.’ (Moro. 10:5.) **Then they receive ‘the spirit of revelation,’** and the Lord tells them in their heart and in their mind whatsoever he will. (D&C 8:1–3.)” (Bruce R. McConkie, The Mortal Messiah, 4:98–99). I'm not sure if I'm misinterpreting this paragraph, but to me it sounds as if only Latter-day Saints who acknowledge Joseph Smith as prophet and the Book of Mormon as divine revelation can receive the Gift of the Holy Ghost. Two questions: - Am I right? Can only Latter-day Saints receive the Gift of the Holy Ghost? - If the answer to the question above is "yes": what are the implications for non-LDS Christians? Are there things that Latter-day Saints with the Gift of the Holy Ghost can do that non-LDS Christians (who--as we just agreed--lack of the Gift of the Holy Ghost) can't?