Mistakes of life

In this world there  cant be any such human being who is completely fault less. Each  and every person  in this world has committed some mistakes in his  life or her life.
Mistakes are natural in life, some becomes stable in their life, some dosn't, but does  it mean that the person who couldn't  be stable after  many mistakes is a person who loves to do mistakes ? Isnt it possible that he or she is trying to be stable but no one is trying to see it. Or they just dont want to see  that he or she is trying to be  stable ?  Or they dont want him or her to be stable ?
We dont know who the person is, how is his or her life style, how is his nature ? We are unaware of all this things bcoz even thw person who is staying together would not predict or know what the other is facing. Or sometimes they dont care to know all these things, or everytime they thinks the same. The reason is simple they think they are perfect and what they do is always perfect and right, they never commit any mistake bcoz they are perfect.
But is this true ? Are they perfectly faultless ? Never have  they committed any mistakes in their life ? Mistake is mistake small or big.
Now the question arises is that "Do such persons have any right to correct any other person who also commits mistakes ?"
Is it not possible that the thing which they are considering as mistakes might not be any mistake at all ?
For eg. : A person has cheated another for 1000 rs. Now we will say that its a mistake of ethics. One should not cheat anybody. But friends do we know thw reason for cheating ? Perhaps the person who has committed this mistake may have tried a loot to gain money ethically but could not gain it. He or she was trying n doing for his or her family. After lots of try n hard work he finally cheated. Cheated for his or her family who had not eaten a single bite of bread since last few days. Now if this is the reason, has that person committed a mistake ?
In this practicle and autocratic world a person with immotions and thinking with heart  is a person full of mistakes. Is it true ? Can't a person be immotional or cant a person think or act with his heart ?
My friends, I cant understand what actually is a mistake ? Can anybody please help me to understand this word "mistake" ??