Questions & Answers about Rozwój wymaga zaufania do siebie.
Why do we use the full word siebie here instead of just się?
In Polish, you must use the full, independent form siebie after a preposition like do. The short form się is never used immediately after a preposition.
What case is siebie here, and what triggered it?
It is in the genitive case, which is required by the preposition do. Conveniently, the genitive and accusative forms of this reflexive pronoun are exactly the same: siebie.
Why does the word for trust, zaufanie, change to zaufania in this sentence?
The verb wymagać (to require) always forces the noun that follows it into the genitive case. Therefore, the nominative zaufanie becomes the genitive zaufania.
In English we say trust in oneself. Why does Polish use do here?
Polish conceptualizes trust as something directed towards a person rather than placed inside them. Because of this, the noun zaufanie always pairs with the preposition do.