Do not judge others self-righteously, and you will not be judged. Do not condemn others when you are guilty and unrepentant, and you will not be condemned for your hypocrisy. Pardon others when they truly repent and change, and you will be pardoned when you just truly repent and change. Like begets like, as simple as that.
Don’t pick on people, jump on their failures, criticize their faults—unless, of course, you want the same treatment. Don’t condemn those who are down; that hardness can boomerang. Be easy on people; you’ll find life a lot easier. Give away your life; you’ll find life given back, but not merely given back—given back with bonus and blessing.