If you're referring to the one who quote that sentence, it would be unknown, but it is a really famous quote.
If
you wanted to restates the main idea of this quotation , it would be :
it's not good to criticize others because we don't know that they face
in life.
hope this helps!
This is lyrics means a poem
Your supposed to have this in a text or movie because if you reread it you can find the letter and it will tell you everything you need to know.
To denunciate is to accuse a group of people for doing something. A denunciation is an accusation.
