This is just a sentence. You could add some meaning behind it, and make it a proverb yourself, but it really is just a sentence. Good luck!
If the title is "After Hours in Kindergarten" then the theme is about what goes on in a kindergarten's experience while in school. It provides the theme and tells you what you’ll be reading about.
It can illustrate your level of education.
hope it helps
if I am wrong then I am sorry but this one sounds the most accurate to me.
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Do you have any other questions?