Reason uses imagination as a vestment outside and around it; if reason becomes too pleased with its dress, imagination, this imagination adheres to it like a skin; separation is effected only with great pain.
Hugo of St. Victor (d.1141) 1
Rather than projecting the shadow of Tomorrow's unknowable realities, I propose to ask whether it is imaginable — I stress this crucial word — to exercise effective control over the future‐ shaping forces of Today. This rescues us from the impossible attempt to predict the shape of Tomorrow, and leaves us with the somewhat less futile effort of inquiring into the possibilities of changing or controlling the trends of the present. ... Can [the] intrusion of science and technology be bounded, confined to its needed applications, and kept from sucking the life out of our engagement with nature and with one another? I find that difficult to imagine.
Robert Heilbroner (1995: 95,99)