The worst sin towards our fellow creatures is not to hate them, but to be indifferent to them; that's the essence of inhumanity. -- G.B. Shaw
I agree with this. Human beings are not complete in isolation; we are herd animals. We need each other in a very profound way and indifference toward others, silencing or isolating others are ways of denying them their humanity.
Needless to say, this is a sin of which I am guilty. As much as I hate being invisible, I often fail to see others. As with so many of my shortcomings, I just have to work on that.