Quote from : Star Wars: Episode V - The Empire Strikes Back Movie

Yoda: Why wish you become Jedi?
Luke: Well, mostly because of my father, I guess.
Yoda: Ahh... father. Powerful Jedi was he. Powerful Jedi.
Luke: [suspcious] Oh, come on! How can you know my father? You don't even know who I am. Oh, I don't even know what I'm doing here! We're wasting our time!
Yoda: [Looking away from Luke] I cannot teach him. The boy has no patience.
Obi-Wan: [voice-over] He will learn patience.
Yoda: Much anger in him... like his father.
Obi-Wan: [voice] Was I any different when you taught me?