Elder Richard G. Scott has written: “Your happiness now and for the eternities will unquestionably be determined by whether or not you follow the spiritual guidance of the Lord communicated through the Holy Ghost…” “The counsel of others and the programs of the Church are useful aids but not the best source of fundamental direction in your life. That guidance comes from the Lord through the Holy Ghost.”
“Spirituality yields two fruits. The first is inspiration, that is, to know what to do. The second is power—the power of God or the capacity to do what one has been instructed to accomplish.” (Richard G. Scott, Finding Peace, Happiness, and Joy, p. 39-40)
It is absolutely essential to our mission on earth that we know what the Lord wants us to do through the Holy Ghost, and that we have the power to do it through the Holy Ghost. This is feasting on the words of Christ, or communicating and living in the language of the angels.
(Don't ask me why those last paragraphs are so tiny. I have no idea...)