The only way of expressing emotion in the form of art is by finding an "objective correlative"; in other words, a set of objects, a situation, a chain of events which shall be the formula for that particular emotion; such that when the external facts, which must terminate in sensory experience, are given, the emotion is immediately evoked.
T. S. Eliottime past and time future what might have been and what has been point to one end, which is always present.
T. S. Eliot