The song at the end of the Passover hagada "One Goat."

I think that חד גדיא (one goat) is a very important lesson about במדה שאדם מודד בה מודדים לו which comes from a Gemara. That is: What one dishes out to others always comes back a full circle. [Lit. "The measure one measures out to others is the same measure that will be measures out to him from heaven."] 
I have seen this countless of times myself. And I am always shocked when I see people doing evil to others and I wonder to myself why do they not realize that what goes around comes around.

But that is just how I have understood that Piut [song]myself. I think that is clearly what it is saying. 

I should mention that I am not immune to the process of מדה כנגד מדה. [what one gives is what one gets,] Thus I see everything that has gone wrong in my own life as a direct result of my own sins. This comes from a statement in the Talmud. אין יסורים בלי עוון. (There is no suffering without sin.) Now you could ask on that from Job. But still I am just saying how I see things myself based on my experiences in a Musar Yeshiva in NY. That is I try to see what faults there are in me when things do not go my way. This approach I am very happy that I gained in yeshiva. Because I have seen lots of people when things do not go their way their first reaction is to blame others and almost never look into themselves.

I imagine that if I had not learned this in yeshiva from where could I have learned it? Thus I am grateful to God that I spent some important years in an authentic Lithuanian yeshiva. Whether I learned well or not is not the issue. Rather what is important is some amazing lessons in having the right attitude that I gained there.