This is one of those quotations which turns up in all kinds of contexts, ascribed to all kinds of characters and authors. I have heard it used, for example, as a rallying cry in one dramatized version of Alexandre Dumas's Three Musketeers. The subject-matter of the quotation predisposes us to think of it as coming from a great romantic - a Shakespeareian lover, say. When we read that it is from Saint Augustine, the quotation takes on a fresh allure, as we reflect on the implications on how such words could emanate from one of the world's greatest saints