It is not advisable, James, to venture unsolicited opinions. You should spare yourself the embarrassing discovery of their exact value to your listener. - Ayn Rand
It is a sign of arrogance to be mad at someone for not acting as per your advice, especially if it was unsolicited. - Mokokoma Mokhonoana
The greatest fear in life is not of death, but unsolicited change. - Raheel Farooq
Never offer unsolicited advice. The receiver might not know that you are smarter than him. - C.J. Langenhoven