Anima Mundi (Chap.25) William Butler Yeats

The dead living in their memories, are, I am persuaded, the source of all that we call instinct, and it is their love and their desire, all unknowing, that make us drive beyond our reason, or in defiance of our interest it may be; and it is the dream martens that, all unknowing, are master-masons to the living martens building about church windows their elaborate nests; and in their turn, the phantoms are stung to a keener delight from a concord between their luminous pure vehicle and our strong senses. It were to reproach the power or the beneficence of God, to believe those children of Alexander who died wretchedly could not throw an urnful to the heap, nor that Caesarea2 murdered in childhood, whom Cleopatra bore to Caesar, nor that so brief-lived younger Pericles Aspasia bore being so nobly born.

2. I have no better authority for Caesarea than Landor’s play.