We do not have the words (even the scriptures do not have words) which perfectly describe the Spirit. The scriptures generally use the word voice, which does not exactly fit. These delicate, refined spiritual communications are not seen with our eyes, nor heard with our ears. And even though it is described as a voice, it is a voice that one feels, more than one hears.
Once I came to understand this, one verse in the Book of Mormon took on a profound meaning, and my testimony of the book increased immeasurably. It had to do with Laman and Lemuel, who rebelled against Nephi. Nephi rebuked them and said, “Ye have seen an angel, and he spake unto you; yea, ye have heard his voice from time to time; and he hath spoken unto you in a still small voice, but ye were past feeling, that ye could not feel his words.” (1 Ne. 17:45; italics added.)
“The Candle of the Lord,” Elder Boyd K Packer, Ensign, Jan., 1983