Someone warned me that: "The more opinions you show, the more
vulnerable you are." at my first job.

At that time, I was puzzled by the how he meant by saying "warning".
"If you don't show people your opinions, how do you know whether
your opinions are correct or not?" I was wondering, and that was
like 15 years ago. It was a fact that we are putting ourselves in the
harm's way by telling people what you think, but should we not doing
that?

Now, after all these years, I still love to share my opinions.
Even doing so does put me on a more vulnerable position, but, it is
how I am, what I do. At least for now, I know what I think is right, and
what is wrong.

A person's vulnerability may be contributing to the team's ultimate
success.
No matter what, it is worthy of, at least for me, really!

In the work place, there are these people trying to play smart guys,
but actually they are draining your emotional and psychological well-being.
It is better to learn how
those people's brains work, and how to best defense yourself, if
necessary.