Well a few paragraphs is alot but i think individualy because you know that you did it all by yourself and you tried while as a team you had some help, i think its the feeling that really makes it better
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!