Breakdown of Toisen suuntavaisto pettää luolassa, jonne toinen harhautuu.
toinen
other, another; second
joka
who / which (relative pronoun)
luola
cave
pettää
to betray
Questions & Answers about Toisen suuntavaisto pettää luolassa, jonne toinen harhautuu.
Why does this sentence use jonne instead of johon or mihin?
In standard written Finnish, you must use forms of joka (rather than mikä) to refer back to a physical location like luola (cave). Since the verb harhautua requires movement into a place, we need a destination form. While johon would be perfectly correct, jonne is a specialized relative pronoun used specifically for physical destinations. Using mihin here would be considered colloquial or poor style in formal writing.
Doesn't wandering off in the cave imply being inside the cave? Why is it jonne (into which) rather than jossa (in which)?
This is about verb rection. In Finnish, the verb harhautua (to stray, to wander off) is treated as a movement arriving at a destination, rather than a continuous action happening statically within a place. Because you are straying into the cave, the verb demands a destination case. Therefore, we must use the directional jonne instead of the static jossa.
How does the pair toisen ... toinen translate to 'one's ... the other'?
When you use toinen twice in a sentence, it creates the 'one ... the other' structure. The first one is in the genitive case (toisen) because it possesses the sense of direction (suuntavaisto), meaning 'one's'. The second is in the nominative (toinen) because it is the subject doing the wandering (harhautuu), meaning 'the other'.