The ego's relation to the id might be compared with that of a rider to his horse. The horse supplies the locomotive energy, while the rider has the privilege of deciding on the goal and of guiding and powerful animal's movement. But only too often there arises between the ego and the id the not precisely ideal situation of the rider being obliged to guide the horse along the path by which it itself wants to go.
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Citation
Freud, Sigmund. New Introductory Lectures on Psycho-Analysis, translated by James Strachey. W. W. Norton & Company, 1990, lecture 31. Originally published as Neue Folge der Vorlesungen zur Einfuhrung in die Psychoanalyse [New Introductory Lectures on Psycho-analysis]. Internationaler Psychoanalytischer Verlag, 1933, lecture 31.