Because my mission statement has gotten longer, I have to keep it posted in my office/closet.
And yes, I have absolutely tweaked it over time. I remember starting out with the idea that I wanted them to be happy with their choices in life. I remember having the mission to make certain they were happy, well educated, and well traveled.
Nowadays, my mission is to assist my girls on their mission to self-actualization. Meaning, understanding who they are (mentally, physically, spiritually, and emotionally), having confidence in that, (using introspect, research, communication, and personal growth skills) creating what they want, and loving themselves enough to make a difference.