Convincing... Is an adjective words.
To convince in something we must be confident... To be confident we must do convincing thing that can convince us to do the convincing thing... It sounds complex... But that is how I described it... Heheh I am technical person... To make it simple convincing is hard to do... The faith in ourselves(our God too) is really important element in this thing.
To make people believe in my words, I have to make my own backup for my own statement. It is like playing chess which we have to have strong strategy to win the game. We must understood well to convince others. The characteristics that we show also have to be honest. Obviously, how can we trust a criminal?? That is just an opinion..