There is a very powerful Spirit that testifies of the truthfulness of what the Savior teaches in these verses. Even the angels in heaven shout glorious praises to the great King Emmanuel when they are brought to consider such doctrines as these.
There is an indescribable portal or connection between this world and the next. The reality of this connection cannot be disputed or contested. It is so perfectly veiled in faith as to not be discernible to any of the human senses, save it be our spirits which are in us. Yet, those who have experienced its power know that at the other end of the line is our Father in Heaven, who stands ready to listen and give instruction as we turn to Him.