Thought:  there is a bell curve with comfort on one end and extreme discomfort on the other.  Just like many other things, the middle ground seems to be the best.  However it is important to wax and wane back and forth between being slightly out of your comfort zone (to grow) and then moving back into that comfort zone (to rest).

All this being said, I just attended a speaking engagement about a variety of topics, one being brain development.  The speaker noted that when you get out of that 'comfort zone' just a little your brain begins to grow and you learn so much more (especially when you make mistakes).  So, try to get out of your comfort zone just a little today!