He has to modify his plans for the first couple, by barring access to the tree of life. That was not something presumably he planned to do This is in response to, perhaps, their unforeseen disobedience certainly the way the story unfolds that's how it seems to us.

他更改了他的原计划，除了不能接近生命树,这些并不是他本打算做的事情,这也许是对意外挑衅的回应,故事是对后人的警告。

耶鲁公开课 - 旧约导论课程节选