Kindness is very simply,
TREATING OTHERS HOW YOU WANT TO BE TREATED
That's what I live by.
That's why if someone respects me, I will return it back to them.
If someone tries to belittle me or attempt to make me feel inferior, I will take a step back and assess the proper response and correct them while setting them straight!
How do you feel when someone has been kind to you and when you have been kind to others?
I got this particular feeling as far back as childhood. One year during Christmas, I was more concerned with giving rather than receiving. I was looking forward to having my family enjoy themselves by seeing what I gave them, instead of being concerned so much with what I was getting. It really gives me a sense of satisfaction or a sense of serenity to be kind to others, even if it is nothing more than helping them.