Ja 126 The Story about the Sword Fortune-Teller
(Asilakkhaṇajātaka)
In the present, in order to take a bribe, a brahmin pretends he can tell whether swords are lucky or not by sniffing at them. One smith puts pepper on his sword which causes the brahmin to sneeze and cut off his nose. The Buddha tells a story in which a young man sneezed and scared off his enemies and won his bride at the same time, showing that sneezing though unlucky for one, was lucky for another (full story).
1. Tathevekassa kalyāṇaṁ, tathevekassa pāpakaṁ,
Tasmā sabbaṁ na kalyāṇaṁ, sabbaṁ cāpi na pāpakan-ti.
In the same way that which is good for one, is bad for another, so nothing is completely good, and nothing is completely bad.
[The commentary here adds nothing to our understanding.]