A brief bit of Herman Bavinck, taken from his Beginselen der psychologie, 2d. ed. (Kampen: Kok, 1923); English translation Foundations of Psychology, trans. trans. Jack Vanden Born (M.C.S. Thesis: Calvin College, 1981). p. 92:
The freedom with which imagination brings forward its creation is, however, not a lawlessness. Unbridled fantasy produces only the outrageous. As fantasy is objectively, albeit indirectly, bound to the elements of the visible world, so it must subjectively be under the control of understanding. It must be led by moral ideas especially. But within these limitations fantasy is a splendid capacity.
See also, “The Morality of Narrative Imagination.”