it pours
It is a sure sign of a little mind to be doing one thing, and at the same time to be either thinking of another, or not thinking at all. One should always think of that one is about; when one is learning one should not think of play; and when one is at play, one should not think of one’s learning. Besides that, if you do not mind your book while you are at it, it will be double trouble to you, for you must learn it all over again.