This is part 2 of a post I had quite a while back: Flexibilty: Part 1 - Body Flexibility
Having a flexible body helps with karate. It is equally important to have a flexible mindset.
If a student shows up at class with a pre-conceived notion of what they will learn or tries to fit the teachings into a particular box, then they stand to be disappointed or miss the point of training.
There is a Zen saying: "Empty your Cup". There is a parable associated with this saying, that I'm sure you can go and google if you're interested, however, the long and short of it is that students (and teachers) should "Empty their cup" before they train. In other words, come to training with a clear mind, or a mind like a beginner.