I have been searching for a quote by Tolkien, presumably from The Silmarillion, which says (paraphrasing here) that the great kings had a sadness in them because they had seen the suffering from the past and so they did not take part in the merry making activities.
I have searched the internet and have found some related quotes but could not find the one I am looking for (which, I should be able to recognise upon reading). However, similar quotes from Tolkien are also welcome.