The best gift a parent can give a child is a happy, healthy parent and role model. I highly recommend you listen to Ziglar's tapes yourself, take the screening test for yourself and get treated if necessary. Follow the advice in the "retraining the brain" section, and always remember children learn by example. Saying one thing and doing another is one way of guaranteeing problems with your children over time.
There are a few old sayings that fit this concept:
"I'd rather see a sermon than hear one any day."
"What you do speaks so loudly I can't hear a word you're saying"
"Actions speak louder than words."
I highly recommend Zig Ziglar's tape series "Raising Positive Kids in a Negative World."