but we do not grant you the rank of master

Звёздные войны. Эпизод 3: Месть Ситхов (2005) Samuel L. Jackson as Mace Windu

but we do not grant you the rank of master

But we do not grant you the rank of master
Mace Windu : In the name of the Galactic Senate of the Republic, you’re under arrest, Chancellor.
[after Anakin is assigned by the Jedi to spy on Chancellor Palpatine]

Supreme Chancellor: Did you ever hear the tragedy of Darth Plagueis “the wise”?
Anakin Skywalker: No.
Supreme Chancellor: I thought not. It’s not a story the Jedi would tell you. It’s a Sith legend. Darth Plagueis was a Dark Lord of the Sith, so powerful and so wise he could use the Force to influence the midichlorians to create life. He had such a knowledge of the dark side that he could even keep the ones he cared about from dying.
Anakin Skywalker: He could actually save people from death?
Supreme Chancellor: The dark side of the Force is a pathway to many abilities some consider to be unnatural.
Anakin Skywalker: What happened to him?
Supreme Chancellor: He became so powerful. the only thing he was afraid of was losing his power, which eventually, of course, he did. Unfortunately, he taught his apprentice everything he knew, then his apprentice killed him in his sleep. It’s ironic he could save others from death, but not himself.

Mace Windu: You are on the council, but we do not grant you the rank of master.
Anakin Skywalker: What? How can you do this? This is outrageous, it’s unfair. I’m more powerful than any of you. How can you be on the council and not be a master?
Mace Windu: Take your seat, young Skywalker.
Anakin Skywalker: Forgive me, Master.

COUNT DOOKU: I sense great fear in you, Skywalker. You have hate, you have anger, but you don’t use them.

PADMÉ: So, this is how liberty dies, with thunderous applause.

But we do not grant you the rank of master
Mace’s excuse? “He has control of the senate and the courts. He’s too dangerous to be left alive.”
It makes perfect sense.

But we do not grant you the rank of master
PALPATINE: Do it!!
Even when Anakin placed his trust in the Jedi Order, by exposing Palpatine as a Sith Lord, they didn’t fully trust him. Certainly they had good reason not to, but this merely confirmed in his mind what Palpatine had told him: that the Jedi could not be trusted, that they were afraid of Anakin’s power:

References:

http://www.moviefanatic.com/quotes/you-are-on-the-council-but-we-do-not-grant-you-the-rank-of-maste/
http://www.shmoop.com/study-guides/movie/revenge-of-the-sith/quotes
http://www.starwars.com/news/mace-windu-anakin-skywalker-right-and-wrong
http://scifi.stackexchange.com/questions/126756/why-did-anakin-turn-to-the-dark-side
http://buyresearchpapers.net/