It has frequently been said that we never desire what we think absolutely inapprehensible: it is however true that some of our sharpest agonies are those in which the object of desire is regarded as both possible and imaginary.
T.S. (Thomas Stearns) Eliot (1888–1965), U.S.-British modernist poet. Eliot's doctoral dissertation in philosophy; submitted to Harvard in 1916. Knowledge and Experience in the Philosophy of F.H. Bradley, ch. 2, Columbia University Press (1964).