Murray's words and training philosophy resonated with me, and made me realize that working harder in training would improve my race day results (this sounds like a no brainer, but the idea of completing really hard and challenging training sessions improving my performance of race day really appealed).
I think that with the calf pain I have been coping with, I have become a bit lazy with my running in the last few weeks. I have been running reasonable distance, but mostly very slowly (12km without getting out of breath, and barely breaking a sweat), so this week I have begun to push myself a bit harder. I have been running more trail and hill sessions (which are so much fun, and help me to really feel the burn), and pushed myself quite hard on my birthday 12km, finishing in 50min. It is more satisfying to push harder, and quite motivating to know that I am going out to do a training session that will "hurt". I am also doing more core strengthening work, walking and lots of stretching. The extra work seems to be helping.
I suppose the old adage "no pain, no gain" is somewhat true.