From Augustine's Confessions, Book 11:

What now is clear and plain is, that neither things to come nor past are. Nor is it properly said, "there be three times, past, present, and to come": yet perchance it might be properly said, "there be three times; a present of things past, a present of things present, and a present of things future." For these three do exist in some sort, in the soul, but otherwhere do I not see them; present of things past, memory; present of things present, sight; present of things future, expectation.

The man who spoke at my high school graduation (East Central High School in Tulsa, Class of '78) actually quoted this passage of Augustine's in his speech, which I remember as part of my present of things past. Unfortunately I have forgotten the speaker's name.