 There have been additional objections to immortality as undercutting meaningfulness, but they are prima facie less powerful than the previous three in that, if sound, they arguably show that an eternal life would have a cost, but probably not one that would utterly occlude the prospect of meaning in it. For example, there have been the suggestions that eternal lives would lack a sense of preciousness and urgency (Nussbaum 1989, 339; Kass 2002, 266–67), could not exemplify virtues such as courageously risking one’s life for others (Kass 2002, 267–68; Wielenberg 2005, 91–94), and could not obtain meaning from sustaining or saving others’ lives (Nussbaum 1989, 338; Wielenberg 2005, 91–94). Note that at least the first two rationales turn substantially on the belief in immortality, not quite immortality itself: if one were immortal but forgot that one is or did not know that at all, then one could appreciate life and obtain much of the virtue of courage (and, conversely, if one were not immortal, but thought that one is, then, by the logic of these arguments, one would fail to appreciate limits and be unable to exemplify courage).