"We can never judge the lives of others because each person knows only their own pain and renunciation. It's one thing to feel that you are on the right path, but it's another to think that yours is the only path."
You can't really judge the lives of others because of the simple handicap that each person knows only about his/her own experiences; to judge the lives of others means to assume that you understand/know all the trials and hardships and all things it is that have led that person up to that point.
Our own perspectives are biased. As much as we may try, our perspectives are defined and are affected by our own trials and all that it is that we have endured; therefore, when we see others, it is through our eyes that have already been accustomed to certain things in our own life.
Many of us have the tendency to think that our own way of doing things is right. Many of us assume that our lives are right and lived by just means and in the right way; however, to assume that it is the only right path is an entirely a different matter.
A path to learn in all this is the acceptance of others and the acceptance of one's self.