It is not good to work all the time, nor it is good to play all the time. When you work, you should work in earnest, and then you will be the more happy when you play. Do one thing at one time, and do it well. If you have any work to do, take hold of if in earnest, and you will soon finish it. If you have a lesson to learn, don't stop no matter how hard it is, and do nothing else, until you have mastered it.