As with Samuel, the Lord can fill the empty mouth as promised, ’lift up your voices unto this people; speak the thoughts that I shall put into your hearts, and you shall not be confounded before men; For it shall be given you in the very hour, yea, in the very moment, what ye shall say’ (DC 100:5-6). There are many saints who have not had this sort of experience. They may wonder what is it like to have the Lord fill their hearts so fully that ‘whatsoever they shall speak when moved upon by the Holy Ghost shall be scripture’ (DC 68:4). Significantly, the Lord doesn’t speak to our minds but rather speaks to our hearts. This is according to the voice of the Spirit which is more often felt than heard. Joseph Smith explained what this feels like.
Joseph Smith
“…the spirit of revelation [is] when you feel pure intelligence flowing into you, it may give you sudden strokes of ideas, so that by noticing it, you may find it fulfilled the same day or soon; (i.e.) those things that were presented unto your minds by the Spirit of God, will come to pass; and thus by learning the Spirit of God and understanding it, you may grow into the principle of revelation, until you become perfect in Christ Jesus.” (Teachings of the Prophet Joseph Smith, p. 151)