Sometimes I find it too hot to run, and sometimes too cold. Or too cloudy. But I still go running. I know that if I didn't go running, I wouldn't go the next day either. It's not in human nature to take unnecessary burdens upon oneself, so one's body soon becomes disaccustomed. It mustn't do that. It's the same with writing. I write every day so that my mind doesn't become disaccustomed.