Speak well of your friend; of your enemy say nothing.Proverbs and old sayings Welsh about enemies, nothing
Speak of the devil and he shall/is sure/will appearProverbs and old sayings British about devil, old, olderness
Speak kind words and you will hear kind answers.Proverbs and old sayings South American about americans
Speak little of your ill luck, and boast not of your good luck.Proverbs and old sayings Danish about good luck, bad luck, good