Proverbs 23:7 says, “as a man thinks in his heart, so is he, ” which means what you think about predominately is what you will become or already are. In reverse, choose to think and meditate on being the kind of person you want to become and you will meditate and envision yourself into that kind of person. 2 Corinthians 10:5 says that we are to take every thought captive to the obedience of Christ. The most important discipline in life is taking captive every thought and choosing to think thoughts that are positive, wholesome, holy, thoughts about activities and ways of acting and talking that are pleasing to Christ. Because our mind is such an independent thing inside us, we have to be continually listening to what our mind is thinking; this is such a fundamental part of growing mature. It is worth reminding ourselves constantly to stay on top of this discipline.
It is easy to begin thinking critical, judgmental thoughts about others, but it so important not to let your mind go there. It may be true the thoughts you are having about others, but those thoughts don’t change them, and they just make you an unhappy person.