The Nature of Rationality (1993), Ch. V : Instrumental Rationality and Its Limits; Rationality's Imagination, p. 181
Quotes from book
The Nature of Rationality

The Nature of Rationality is 1993 book by the philosopher Robert Nozick, in which the author explores practical rationality.
The Nature of Rationality (1993), Ch. V : Instrumental Rationality and Its Limits; Rationality's Imagination, p. 181
Context: Our principles fix what our life stands for, our aims create the light our life is bathed in, and our rationality, both individual and coordinate, defines and symbolizes the distance we have come from mere animality. It is by these means that our lives come to more than what they instrumentally yield. And by meaning more, our lives yield more.