(via Found Objects)
(whose Bollops provides the background: in Olaf Stapledon's Last and First Men, various stages of Humanity have come and gone, now it's the Fifth Men, who've "developed a pseudo-time-travel technique which enables them to experience the past by hitching a ride in the minds of people who lived hundreds, thousands, millions of years ago"):
"The access to the past had, of course, far-reaching effects upon the culture of the Fifth Men. Not only did it give them an incomparably more accurate knowledge of past events, and insight into the motives of historical personages, and into large-scale cultural movements, but also it effected a subtle change in their estimate of the importance of things. Though intellectually they had, of course, realized both the vastness and the richness of the past, now they realized it with an overwhelming vividness. Matters that had been known hitherto only historically, schematically, were now available to be lived through by intimate acquaintance. The only limit to such acquaintance was set by the limitations of the explorer's own brain-capacity. Consequently the remote past came to enter into a man and shape his mind in a manner in which only the recent past, through memory, had shaped him hitherto. Even before the new kind of experience was first acquired, the race had been, as was said, peculiarly under the spell of the past; but now it was infinitely more so. Hitherto the Fifth Men had been like stay-at-home folk who had read minutely of foreign parts, but had never travelled; now they had become travellers experienced in all the continents of human time. The presences that had hitherto been ghostly were now presences of flesh and blood seen in broad daylight. And so the moving instant called the present appeared no longer as the only, and infinitesimal, real, but as the growing surface of an everlasting tree of existence. It was now the past that seemed most real, while the future still seemed void, and the present merely the impalpable becomingness of the indestructible past."
"At all times, in all pursuits, the presence of the tragic past haunted them, poisoning their lives, sapping their strength."
Sounds like Olaf had maybe read Nietzche's On the Use and Abuse of History for Life (from Untimely Meditations) e.g.
"Antiquarian history itself degenerates in that moment when it no longer inspires and fills with enthusiasm the fresh life of the present. Then reverence withers away. The scholarly habit lives on without it and orbits in an egotistical and self-satisfied manner around its own centre. Then we get a glimpse of the wretched drama of a blind mania for collecting, a restless compiling together of everything that ever existed. The man envelops himself in a mouldy smell. With the antiquarian style, he manages to corrupt even a significant talent, a noble need, into an insatiable new lust, a desire for everything really old. Often he sinks so deep that he is finally satisfied with that nourishment and takes pleasure in gobbling up for himself the dust of biographical rubbish"