You can do nothing with others unless you are able to do it with yourself. You can never give a good advice to anyone unless you are able to give it to yourself first, and to follow it. And if you see a difficulty somewhere, the best way of changing this difficulty is to change it in yourself first. If you see a defect in anyone, you may be sure it is in you, and you begin to change it in yourself. And when you will have changed it in yourself, you will be strong enough to change it in others. And this is a wonderful thing. People don’t realise what an infinite grace it is that this universe is arranged in such a way that there is a collection of substance, from the most material to the highest spiritual, all that gathered together into what is called a small individual, but at the disposal of a central Will. And that is yours, your field of work, nobody can take it away from you, it is your own property. And to the extent you can work upon it, you will be able to have an action upon the world. But only to that extent. One must do more for oneself, besides, than one does for others.
Ref: The Sunlit Path