Second comforter/visions of eternity

An "interesting" definition

When the Lord has thoroughly proved him, and finds that the man is determined to serve him at all hazards, then the man will find his calling and election made sure, then it will be his privilege to receive the other Comforter.” To receive the other Comforter is to have Christ appear to him and to see the visions of eternity. (Teachings, pp. 149-151.) from Mormon Doctrine, p. 109, under the heading “Calling and election Sure”