"The reason for you complaint lies, it seems to me, in the constraint which your intellect imposes upon your imagination. Here I will make an observation, and illustrate it by an allegory. Apparently, it is not good-and indeed it hinders the creative work of the mind-if the if the intellect examines too closely the ideas pouring in, as it were, at the gates."

Source: The Conspiracy of Fiesco by Friedrich Schiller, Act I, sc. xviii, 1783.