Anne of Green Gables
by Lucy Maud Montgomery

“I’m just as ambitious as ever. Only, I’ve changed the object of my ambitions. I’m going to be a good teacher – and I’m going to save your eyesight. Besides, I mean to study at home here and take a little college course all by myself. Oh, I’ve dozens of plans, Marilla. I’ve been thinking them out for a week. I shall give life here my best, and I believe it will give its best to me in return.

When I left Queen's my future seemed to stretch out before me like a straight road. I thought I could see along it for many a milestone. Now there is a bend in it. I don't know what lies around the bend, but I'm going to believe that the best does. It has a fascination of its own, that bend, Marilla."

What is the theme of this excerpt?