He shouldn't try to be something higher than he actually his. Man is a being in this world, a mere inhabitant. To forget that and try to rise above it is only asking for trouble. According to objectivism, reason is man's tool to know everything about the world. With reason, man's knowledge knows no bounds.
Reason is what elevates man from animals.
It gives him a capacity to think that no other species has. Many people talk about the supposed intelligence of other species, but they cannot answer why those species are not living in conditions such as man. Reason unifies man's senses and gives him the way to perceive reality. Thus, objectivism rejects the idea of thinking with the heart rather than the brain. Emotions have no place in reason.