How does the language and word choice in this paragraph contribute to the tone of this myth?

The name of the elder of these brothers was Prometheus, or Forethought; for he was always thinking of the future and making things ready for what might happen to-morrow, or next week, or next year, or it may be in a hundred years to come. The younger was called Epimetheus, or Afterthought; for he was always so busy thinking of yesterday, or last year, or a hundred years ago, that he had no care at all for what might come to pass after a while.