It seems like every great author talks about this. Collection of quotes and examples here: http://www.slideshare.net/PatrickEMcLean/how-to-kill-a-word
Also, it is unflattering to our ego to practice the things that we are the weakest at. Unfortunately that’s where the biggest return is. I had a teacher explain it to me in terms of pushups. Most people do them fast and they blow right past that spot where they are weakest. But if you do them slow and spend time where you are weak, you will get strong faster. It just sucks more.
