Middle-earth Maxims

[Inziladun]

There is possibly a similar thread buried somewhere among these ancient barrows, but I didn't see one. I hope also that I have placed this correctly.
Being a great admirer of the linguistic style of the books, and having read LOTR, The Silmarillion, and Unfinished Tales more times than I could say, phrases from the books sometimes come into my mind as I'm going about daily business.
The one that I think of the most is from UT, Túrin's words to Androg at Amon Rûdh:

Why must you speak your thoughts? Silence, if fair words stick in your throat, would serve all our ends better.

No doubt that one has kept me out of serious trouble at one time or another.
There are other sayings of a non-Tolkien nature, I'm sure, that carry the same sentiment. What I was wondering is this: Do certain lines from the books occur to you on a regular basis as helpful proverbs?