Read Do as I say, don’t do as I do! in Ehab Heikal’s blog
It is very hard to walk on the same principles you hold others to walk on.
It is hard to lead by example.
It is hard to be consistent with what you think and what you say.
If you see it easy then you are not doing it at all the right way.
It takes continual revision. You have to be a detective looking for your own mistakes. You have to look at your self in the mirror, measure your words against your actions every day. You have to remember your words and be willing to take them back. It takes practice of saying many times sorry you where right till it does not embarrass you any more.
It takes time, effort and dedication to truth.
I have not done it, yet.