How we cite our quotes: All quotations are from Star Wars: The Phantom Menace.
Quote #7
YODA: Confer on you the level of Jedi Knight the council does. But agree with your taking this boy as your Padawan learner I do not.
OBI-WAN: Qui-Gon believed in him.
YODA: [Sighs.] The chosen one the boy may be. Nevertheless, grave danger I fear in his training.
OBI-WAN: Master Yoda, I gave Qui-Gon my word. I will train Anakin.
Obi-Wan also comes of age and becomes a Jedi knight. Having grown in this film, he takes on the role of the teacher, one he will assume for the remainder of the series. By the time he takes Luke as a student, he's obviously had more practice.