Equality
Dooku and Qui-Gon: It was the dream of every apprentice to one day become their Master's equal, Qui-Gon knew. It was that longing to one day be as good as their teacher that motivated the Padawans to practice with their lightsabers even when their hands were covered with callouses and to read their datapads late into the night, absorbing facts while their eyelids itched to shut. Yet, somehow, Qui-Gon realized that no matter how many hours he spent studying, he would never be Dooku's equal, because Dooku would never allow him to be. Dooku had a craving to be the best, and he couldn't allow anyone to be his equal. That was why, in all his lessons, the man always held some kernel of wisdom back, so that the student could never outstrip the teacher.
Qui-Gon and Obi-Wan: When he had started out as Qui-Gon's Padawan, Obi-Wan had nursed a dream of one day becoming Qui-Gon's equal. However, by the time that his apprenticeship was nearing an end, he no longer had that goal, because he had recognized that as he learned more about being a Jedi, the gulf between him and his Master only seemed to widen rather than narrow. Even when he became a hero and a Council member during the Clone Wars long after Qui-Gon had been slaughtered on Naboo by that brutal Sith, Obi-Wan perceived himself as Qui-Gon's inferior. Somehow, though, this notion didn't trouble him as it might have once. As long as he did his best, it didn't matter if his best was better or worse than someone else's.
Obi-Wan and Anakin: Anakin liked to think that the Clone Wars had made him and Obi-Wan equals. After all, it had made both of them heroes and generals with the same responsibilities and burdens for the most part. Anakin even suspected that Obi-Wan would be the first to acknowledge with his typical graceful humility that they were now equals. However, Anakin himself still had trouble accepting that, no matter how many times as an apprentice he had complained that he was more talented than his Master and that Obi-Wan had been holding him back. He blamed the Council for his inability to truly see himself as Obi-Wan's equal, since they had stubbornly refused to grant him a seat on the Council even though he was as good as Obi-Wan. Yes, he constantly told himself, he and Obi-Wan were equals, but Anakin would always feel slighted and overlooked, whereas Obi-Wan would forever be convinced that he was unworthy of any acclaim that he received. They were equals, but they were not identical, and in many ways, they were mirror images of each other.
Anakin and Ahsoka: Ahsoka was well aware that it was every Master's ambition to train an apprentice that was equal to if not greater than the Master. On a while, she thought this was a noble objective, but she also recognized that there were times when it was doomed to failure. After all, Yoda must have instructed countless Padawans in his centuries as a Jedi, and yet none had ever become his equal. She sensed that things would be similiar with her and Anakin--he would try to teach her and she would learn as best she could, but she would never be his equal. She would never be the Chosen One, and, glancing at the haunted expression that sometimes clouded his eyes and the way that his shoulders sometimes hunched as though a galaxy he was unable to carry had been dumped on his shoulders, she couldn't even wish to be his equal. Studying under Anakin Skywalker had taught her that she should be grateful to be just Ahsoka Tano, since names like the Chosen One and the Hero with No Fear just crushed a person under unrealistic expectations.