10/15/2026
Sisu.
Not loud confidence, not bravado, just the stubborn decision to keep going anyway. The word is Finnish, and many Finns see sisu as a defining part of who they are as a people.
It comes from sisus, meaning “insides” or “interior,” so it’s close to the English idea of “having guts.” It’s also strongly tied to Finland’s resistance in the Winter War of 1939–40, when it caught the attention of English-language press.