Verbs of Reaction and Focus
In Finnish, when you direct your attention, attitude, or focus toward something, the target often takes the illative case (the "into" case, usually ending in -Vn, -hVn, or -seen).
A common example is the verb suhtautua (to react to, to relate to). When you talk about your attitude toward a new challenge or studying, the thing you are reacting to is in the illative.
Diving Deep: Becoming Absorbed and Familiarized
When starting a demanding new study program or hobby, you often need to immerse yourself in the material. Several verbs describe delving into a topic, and they all require the illative case.
These include uppoutua (to become absorbed), paneutua (to apply oneself), perehtyä (to familiarize oneself), and syventyä (to delve into). Think of it as mentally diving into the subject.
Passion, Focus, and Getting Hooked
This "into" logic also applies to certain nouns, such as intohimo (passion). To express what you have a passion for, you put the target in the illative (literally, a passion into something).
Similarly, when you get completely absorbed by a new interest or need to direct your attention, verbs like hurahtaa (to get hooked on) and keskittyä (to focus on) also demand the illative case.