14 But we long for those whom we have lost. For two things specially pain us: either the longing for those we have lost, which I experience in my own case; or that we think them deprived of the sweetness of life, and snatched away from the fruits of their toil. For there is a tender movement of love, which suddenly kindles the affection, so as to have the effect rather of soothing than of hindering the pain; inasmuch as it seems a dutiful thing to long for what one has lost, and so under an appearance of virtue weakness increases.
Source: On the Death of Satyrus (New Advent)