In order that people may be happy in their work, these three things are needed:

• They must be fit for it;
• They must not do too much of it; and
• They must have a sense of success in it
- not a doubtful sense, such as needs some testimony of others for its confirmation, but a sure sense, or rather knowldege, that so much work has been done well, and fruitfully done, whatever the world may say or think about it.

W.H. Walden