“Happy work is best done by the man who takes his long-term plans somewhat lightly and works from moment to moment. It is only our daily bread that we are encouraged to ask for. The present is the only time in which any duty can be done or any grace received.” C.S. Lewis in 1939, in a lecture called “Learning During War-Time.” (apparently in https://amzn.to/37QXZik but I haven't looked.)