When words are scarce they are seldom spent in vain.

Words spoken cannot be recalled so think twice before you speak.

There are tones of voices that mean more than words.

Understanding is the heartwood of well-spoken words.

We cannot be speakers who do not listen. But neither can we be listeners who do not speak.

I immediately regretted that last point because I have discovered that in discussions it never helps to take a morally superior tone to one's opponent.