Shun those studies in which the work that results dies with the worker.

Every now and then go away, have a little relaxation, for when you come back to your work your judgment will be surer. Go some distance away because then the work appears smaller and more of it can be taken in at a glance and a lack of harmony and proportion is more readily seen.

Make your work to be in keeping with your purpose.

It vexes me greatly that having to earn my living has forced me to interrupt the work and to attend to small matters.

I know that many will call this useless work. Though I may not, like them, be able to quote other authors, I shall rely on that which is much greater and more worthy-on experience, the mistress of their Masters.

Perfection can never be attained by work.