How we cite our quotes: All quotations are from Star Wars: The Empire Strikes Back.
Quote #4
HAN: We go back a long way, Lando and me.
LEIA: Can you trust him?
HAN: No. But he has no love for the Empire, I can tell you that.
Han and Lando are old pals, so Han assumes that his buddy will have his back. Of course, we all know what ends up going down, but Han probably should've seen this one coming—once a scoundrel, always a scoundrel.
Quote #5
LUKE: I saw a city in the clouds.
YODA: Friends you have there.
LUKE: They were in pain.
Luke cuts his Jedi training short after having a premonition of his friends in danger. Interestingly, Yoda sees this as a bad thing—it shows that Luke still has an emotional attachment to other people, which is against the Jedi code.
Quote #6
LUKE: I can't keep the vision out of my head. They're my friends. I've got to help them.
YODA: You must not go!
LUKE: But Han and Leia will die if I don't.
The Jedi are more like monks than warriors, so it's no surprise that Yoda opposes Luke's decision to leave. More than that, he argues that Luke's attachment to his friends leaves him susceptible to the dark side of the Force, as his love for them could easily lead to fear, which could lead to anger—and we all know where that ends up.