If we rely only on our rational mind and deny or neglect the spiritual understanding we can receive through the whisperings and impressions of the Holy Ghost, it is as if we were going through life with only one eye. But figuratively speaking, we have actually been given two eyes. Only the combination of both views can give us the true and complete picture of all truths and of everything we experience in our lives, as well as of the whole and profound understanding of our identity and purpose as children of a living Heavenly Father

Source: Seeking Knowledge by the Spirit