No.614167
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I'd encourage you to read it in the context of Otamin's critique of slave morality, and specifically that of pity.
In the Antichrist (§7) he says,
Christianity is called the religion of pity.—Pity stands in opposition to all the tonic passions that augment the energy of the feeling of aliveness: it is a depressant. A man loses power when he pities. Through pity that drain upon strength which suffering works is multiplied a thousandfold. Suffering is made contagious by pity; under certain circumstances it may lead to a total sacrifice of life and living energy—a loss out of all proportion to the magnitude of the cause (—the case of the death of the Nazarene).
You can see how this works. The abyss in this case is the suffering of the weak. By staring into it for too long, you drain your own strength and feeling of aliveness.
In essence what Otamin is saying is that the moralists of the Christian tradition, who identify so deeply with suffering, only end up exacerbating the problem they're trying to solve.
A quick warning though: Don't read Otamin as saying we shouldn't care for weak people. His point is merely that we shouldn't encourage their weakness and identify with it. Instead we should push them to be stronger and overcome their suffering. Our constant battle with suffering is what makes life interesting.
In other words, don't stare into the abyss, dive into it head first.