Chapter XIX
25. Now, therefore, O Ruler of thy creatures, what is the mode by which thou teachest souls those things which are still future? For thou hast taught thy prophets. How dost thou, to whom nothing is future, teach future things--or rather teach things present from the signs of things future? For what does not exist certainly cannot be taught. This way of thine is too far from my sight; it is too great for me, I cannot attain to it.436 But I shall be enabled by thee, when thou wilt grant it, O sweet Light of my secret eyes.
CHAPTER XX
26. But even now it is manifest and clear that there are neither times future nor times past. Thus it is not properly said that there are three times, past, present, and future. Perhaps it might be said rightly that there are three times: a time present of things past; a time present of things present; and a time present of things future. For these three do coexist somehow in the soul, for otherwise I could not see them. The time present of things past is memory; the time present of things present is direct experience; the time present of things future is expectation.437 If we are allowed to speak of these things so, I see three times, and I grant that there are three. Let it still be said, then, as our misapplied custom has it: "There are three times, past, present, and future." I shall not be troubled by it, nor argue, nor object-- always provided that what is said is understood, so that neither the future nor the past is said to exist now. There are but few things about which we speak properly-- and many more about which we speak improperly--though we understand one another's meaning.
CHAPTER XXI
27. I have said, then, that we measure periods of time as they pass so that we can say that this time is twice as long as that one or that this is just as long as that, and so on for the other fractions of time which we can count by measuring.
So, then, as I was saying, we measure periods of time as they pass. And if anyone asks me, "How do you know this?", I can answer: "I know because we measure. We could not measure things that do not exist, and things past and future do not exist." But how do we measure present time since it has no extension? It is measured while it passes, but when it has passed it is not measured; for then there is nothing that could be measured. But whence, and how, and whither does it pass while it is being measured? Whence, but from the future? Which way, save through the present? Whither, but into the past? Therefore, from what is not yet, through what has no length, it passes into what is now no longer. But what do we measure, unless it is a time of some length? For we cannot speak of single, and double, and triple, and equal, and all the other ways in which we speak of time, except in terms of the length of the periods of time. But in what "length," then, do we measure passing time? Is it in the future, from which it passes over? But what does not yet exist cannot be measured. Or, is it in the present, through which it passes? But
436Cf. Ps. 139:6. 437Memoria, contuitus, and expectatio: a pattern that corresponds vaguely to the movement of Augustine's thought in the Confessions: from direct experience back to the supporting memories and forward to the outreach of hope and confidence in God's provident grace.
what has no length we cannot measure. Or is it in the past into which it passes? But what is no longer we cannot measure.