1. I think, it's 50\50 situation. You can be a wise and very kind persone but your speech may sound awful, and people think that your another fool and prefer not listen you. But that's not true. It's the one side of situation.
2. If we look at the second quotation, we find another side. Sometimes, your speech can tell about you and your past more than it needs. So, we must be careful and speak correctly, and also clearly.
3. The third quotation is the hard one. I inetrpreted it as the less person talks about himself the less people know about him or his personal life.
Unfortunately,we were delayed by the traffic jams. Can you drive fast?The rush hour traffic is terrible.The road was rough and bumpy.This area is mainly populated by the farmers.Take your coat off! English is not her cup of tea but she makes up for it with hard work.They set off a month ago.
I have never missed a train.Do you get on a bus there every morning? I am good at riding a bicycle.I am looking forward to disembarking from the ship after such a long voyage.He got into a car and disappeared.