Psychic ability, a sixth sense, the gift of prophecy, clairvoyance, clairsentience - there are many names to describe this quality we simply call "spiritual intuition". Everyone has intuition; the degree to which it is used varies from person to person. Intuition is often defined as "a knowing, without the use of rational processes." Though for those who have a strong connection to their intuition, you know that receiving accurate information through it is as rational and true as any information obtained by the mental process.
Intuition is natural, a part of all of us. Just like an inherent ability for athleticism or an aptitude for the sciences, spiritual intuition can be taught to those who have a little of it, increased in those with a budding penchant, and refined for those who knowingly engage these gifts.