をとるために

in order to take/get

→ を
phrase Rare #29,422
in order to take/get Expresses the purpose of taking or getting something. The meaning of とる depends on context and can include take, get, obtain, reserve, or assume (as in responsibility).
JA: 良い席をとるために、早く出発しましょう。
EN: Let's leave early in order to get good seats.

よいをとるためになすべきすべては早く出かけることだ

All you need to do to get a good seat is leave early.