I put a lot of emphasis on how to treat people. The reason for this is simple. The real success of our personal lives and careers can best be measured by the relationships we have with the people most dear to us - our family, friends, and coworkers. If we fail in this aspect of our lives, no matter how vast our worldly possessions or how high on the corporate ladder we climb, we will have achieved very little.

Your attitude determines your altitude. It really is true that If you think you can, you can; and if you think you can’t – you’re right.

Give yourself something to work toward - constantly.

The first step is the hardest – making a commitment to yourself, for yourself.

Do not desire to fit in. Desire to lead.

Sandwich every bit of criticism between two heavy layers of praise.

I wasn't that interested in the dollars-and-cents part of business. My interest in starting Mary Kay Inc. was to offer women opportunities that didn't exist anywhere else.