One of my favorite tools for personal growth is what I will call “the pointing finger technique”. You know the saying “when you point your finger you have 3 fingers pointing back at you”.
This is a technique that I apply to myself as often as I can as it can help me “see” myself.
When I have this seeing I am then in a better position to love others rather than judge them. This of course assumes I can love myself when I “see” what is inside me.

This is akin to the bible verse saying that we are all sinners and Jesus asking he who is without sin caste the first stone.

This does not mean that we need not correct wrong when we see it, but rather about how we feel about the wrong and if we can respond in an appropriate way to it. What is happening inside me? Sometimes we hear someone say something like “I was beside myself with rage”, a good indication that that someone may need to do a little looking inside. A little “seeing”.