Therefore, any one of you who judges is without excuse. For when you judge another, you condemn yourself, since you, the judge, do the same things.
It is quite easy to reach a place in our minds and in our perspective where our judgement of others is skewed such that we condemn them for words and actions that mirror our own. We are quick to apply God’s mercy to ourselves and God’s justice and judgement to others. We simply have a tendency to grow blind to our own sin and more perceptive of others’ sin. It is a dangerous place to be as Paul describes.
We must remain aware of our own sin and sinful propensities while humbly continuing to seek forgiveness and showing gratitude for Who God is and what He is doing on our behalf and on behalf of others. He is rich in mercy and slow to wrath. Just as He is gracious and forgiving of others so must we be also. We must never lose the perspective of ourselves as sinners saved by the grace of God.