And that is the crux of it all, every environment doesn't allow for your proper growth. Just like certain plants can only thrive in certain types of temperaments and environments, the same thing applies to us.
I think that talking about this is important, especially for those interested or in graduate school. Graduate school is full of moments that will push and pull you and literally force you to grow; however, even with this pull and prodding, there is no guarantee that you will thrive. There is no guarantee that you actually even grow. Hell, there is no guarantee that you will even survive.