One the principles that I seek to apply is 'listening'. Actually the principle would be 'sound judgement' and 'listening' could be an act required for that but I tend to treat 'listening' as a principle itself.
My reason for this is fairly simple. There is too much noise in this world and things that should be heard get lost in that noise. This in turn leads to do dissatisfaction in human beings. People need to be heard to know that they matter and I seek to be the listener.
There are other reasons as. Listening is an extremely good way to learn. It is the act of beginning of learning. The child speaks it's first words based on what it hears. Similarly one can learn all sorts of things just by opening one's ear.
That is a great principle. Listening is one of the hardest skills to master. It takes much more energy to listen intently than to speak. But you are right - you can learn much more.
That's one of the reasons that it became my priority. It is so difficult to stick to my guns sometimes. I can't claim that I have mastered the art of listening -more like still in the process.
Jordan Peterson talks about this a lot - especially in his book 12 rules for life. People will tell you a lot if we can only listen.