One of the most thought provoking passages in Lewis Hyde's book A Primer for Forgetting: Getting Past the Past, is about time and St Augustine's Confessions. Here it is:
He moves then to thinking of these temporal categories as existing not by themselves but as human mind-states, all of them taking place in that fleeting present. His boyhood lies in the past, but when he recalls it, he is “looking on its image in present time.” To speak of time with any exactness, we need to say that “there are three times: a present of things past, a present of things present, a present of things to come.” And we have a name for each of these: “The present considering the past is the memory, the present considering the present is immediate awareness, the present considering the future is expectation.”
And time? Time is the experience of simultaneously holding two of these states in mind. When we do so, the mind gets stretched out just as the body gets stretched out when touching two separate spots in space. Augustine’s name for this mental stretching out is “distension”, a term he probably borrowed from Plotinus, who also speaks of time as a “spreading out (diastasis) of life.” Says Augustine, “I have come to think that time is simply a distension. But of what is it a distension? I do not know, but it would be surprising if it is not that of the mind itself.”