"Do not judge and you will not be judged. In the same way you judge others, you will be judged, and the measure you use for others will be used for you. Why do you look at the speck in your brother's eye and not see the plank in your own eye? How can you say to your brother, 'Come, let me take the speck from your eye,' as long as that plank is in your own? Hypocrite, take first the plank out of your own eye, then you will see clearly enough to take the speck out of your brother's eye." (Matthew 7:1-5)
*From Christian Community Bible (Catholic Pastoral Edition):
Usually those who consider themselves as good, or belonging to the group of the converted, judge and criticize those of a different standing. It is a form of pride that spiritual authors call the "fault of beginners." So strongly inscribed is it in human nature that many among the "just" of the Bible have expressed their disapproval of the "sinner" who did not observe the law of God. Contrariwise the new law tells us not to consider ourselves superior or be judges of those who take a different road, or who are led by God to do so. Do not judge. We must exercise good judgment in order to distinguish between the good and evil around us. Though it is a factor of success never to displease anyone, we must have the courage to tell others the wrong that they do. Here "to judge" means to condemn.
When we look at our own lives, we realize that those who helped us grow were those who supported and understood us, not those who judged and condemned us.