"[People who take time for philosophy] alone really live; for they are not content to be good guardians of their own lifetime only. They annex every age to their own; all the years that have gone before them are an addition to their store. Unless we are most ungrateful, all those men, glorious fashioners of holy thoughts, were born for us; for us they have prepared a way of life. By other men's labors we are led to the sight of things most beautiful that have been wrested from darkness and brought into light; from no age are we shut out, we have access to all ages, and if it is our wish, by greatness of mind, to pass beyond the narrow limits of human weakness, there is a great stretch of time through which we may roam."