There is someone that is coming or passing away in your life around the clock,
生命中，不断地有人进入或离开

so you may lose sight of those seen, and forget those remembered.
于是，看见的，看不见了；记住的，遗忘了。

There is gain and loss in your life,
生命中，不断地有得到和失落。

so you may catch sight of those unseen, and remember those forgotten.
于是，看不见的，看见了；遗忘的，记住了。

Nevertheless, doesn’t the unseen exist for sure? Will the remembered remain forever?
然而，看不见的，是不是就等于不存在？记住的，是不是永远不会消失？