Can remembrance lead to sadness?
Once you said so.
Remembrance may often lead to sadness.
Now I understand the meaning of your statement.
Love is inexpressible. Love is beyond words. Young love often remains silent. But when it inclines to express, it finds words unheard of. So are born what you call the love letters. Who wrote these Love Letters? A young heart. It could be his or hers or mine or yours. It doesn't matter if they are written today or were written years back. A Love Letter of a young heart is always young.