Why do we need principles?
“…abstract ideas are conceptual integrations which subsume and incalculable number of concretes – and without abstract ideas you would not be able to deal with concrete, particular, real-life problems. You would be in the position of a newborn infant, to whom every object is a unique, unprecedented phenomenon. The difference between his mental state and yours lies in the number of conceptual integrations your mind has performed. You have no choice about the necessity to integrate your observations, your experiences, your knowledge into abstract principles.” (Rand, 1982, p.6)
Source: Rand, A. (1982). Philosophy: Who needs it. New York: Bobbs-Merrill.