Never underestimate your ability to change yourself...never overestimate your ability to change someone else

I was watching Wayne Dyer deliver his EXCUSES BEGONE on PBS today, and he said:

• Never underestimate your ability to change yourself . . . that was what the lecture was all about . . . and change does not have to take forever . . . but he added.
• Never overestimate your ability to change someone else. How many of us listen and know exactly how what you are hearing is going to apply so well to someone else.