Speaking your mind is never foolish.
You must live in a strange strange world...
As evidence I present the following situation...
Six months ago, a man's wife had a baby. She has had difficulty losing the "baby" weight that she had gained. Before going out for their first "post baby" dinner out as a couple she asks him, "Do I look fat?"
The wise man will answer how?
A) He'll lie, "No dear, you look better then ever!"
or
B) He'll speak his mind, "Yes dear, you're definitely getting fat."
Which of those answers is "foolish"?