"Bigger is not always better when it comes to bowstrings. However, if it is too thin then your arrowheads will not stick in anything." Tsukahara Bokuden, The Hundred Rules of War
Most of us aren't running around with bow and arrow on a regular basis, so how in the world is this applicable today?
Read the quote again and replace "bowstrings" for "character" and "arrowheads" for "words".
Let that simmer for a bit.