I totally agree with you on that we as humans always have room to grown and learn and improve. None of us are perfect and I don't think we ever will, but we can always improve and pay attention to our doings and how we treat others.
If we are always complaining, or jealous, or hating on people, or judgmental which I think majority of people are then it's time to really look in the mirror and find what is really on the inside and what causes us to be like that.
And like you said, it's not easy to change, but you can do it step by step, day by day.
Thank you for this awesome post @journeyoflife