Don't forget the poem that spring breeze turns into rain.

I think what you are asking is "Don't forget the spring breeze and rain". I remember the original sentence was "

This must cherish the service to the country, and don't forget the spring breeze and rain. "

Spring breeze and rain are a good metaphor for edification and education, so I think the meaning of this sentence is never to forget the education of others, and it can be given to teachers, alma mater and classmates who have helped themselves in their studies.