一期一会

Here's one part from the forwarded mail,

Some people come into your life for a SEASON, because your turn has
come to share, grow or learn.

They bring you an experience of peace or make you laugh.

They may teach you something you have never done.

They usually give you an unbelievable amount of joy.

Believe it, it is real. But only for a season.

"Once"

It was only once, possibly the best once.

I was lucky to have had the most memorable once.

Once, but not anymore.