Actually I think it is an important lesson.

A good, modern, quick example might be:

Amy and Betty are both sick and they have medicine to make them better - they have to take one tablet a day. Amy gets lazy and misses a few days, then tries to make up for it by taking a whole bunch at once. Instead of getting better - she gets really sick from overdose. Whereas Amy's friend Betty who continued to take the medicine one day at a time, every day - got better.

The moral here is that for some activities (eg taking medicine, exercise, maintaining a relationship or learning a new skill..). you have to put in small amount of regular, continuous effort - rather than thinking you can make up for it by overdosing on a large amount at one time.