I have learned that those who have the least to say, speak the most, and those who have the most to say, speak the least. Beware those who speak, write, otherwise communicate at 70 mph, their most fervent wishes, their weaknesses, their strengths, and anything that might come across their mind. For these people seldom have anything strong, compelling to say.
Always listen to those who don't speak much. Listen to them very closely, for they will be the ones you can learn from.