It is definitely Buddhist. Buddha says it in a sutta. "Monks, a statement endowed with five factors is well-spoken, not ill-spoken. It is blameless & unfaulted

It is definitely Buddhist. Buddha says it in a sutta. "Monks, a statement endowed with five factors is well-spoken, not ill-spoken. It is blameless & unfaulted by knowledgeable people. Which five? "It is spoken at the right time. It is spoken in truth. It is spoken affectionately. It is spoken beneficially. It is spoken with a mind of good-will." — AN 5.198 btw he later on defines "beneficial" as something that is immediately applicable for the listener, which is just extra good in my opinion.