When passing judgement on others, I think we all have a tendency to do it with a heart of resentment or maybe we have become discouraged and bitter that they have failed us in some way. But truly they have failed only God. If we are angry or hurt from their sin, how do you think it makes Him feel?
We must abound in love. To abound means to exist in great numbers or quantities. To be rich or well supplied. Do we have a large enough amount of love toward others or are we rich in love toward others, that we can judge them with a heart of love toward them?
Phil 1:9,10 "And this I pray, that your love may abound yet more and more in knowledge in all judgment; that ye may approve things that are excellent; that ye may be sincere and without offence till the day of Christ."
The attitude in which we judge others reflects on Christ. It can help win that person back to Him. Or it can hinder them away from Him, even further than they have already gone.