If the sentence has changed you would have to put a period.
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!
It's the second one because I just got doing this and it was right.
What grade level work is this? My guess is 5th grade??
