For want of a nail the shoe was lost. For want of a shoe the horse was lost. For want of a horse the rider was lost. For want of a rider the message was lost. For want of a message the battle was lost. For want of a battle the kingdom was lost. And all for the want of a horseshoe nail."
It reminds me to be aware of the little details, they can trip you up every time in my profession (Programmer/Designer).
For me personally..
Bruce Lee “You must be shapeless, formless, like water. When you pour water in a cup, it becomes the cup. When you pour water in a bottle, it becomes the bottle. When you pour water in a teapot, it becomes the teapot. Water can drip and it can crash. Become like water my friend.”
To me it means be flexible, being rigid will cause more problems than it solves.
Confucius “Walking among three people, I find my teacher among them. I choose that which is good in them and follow it, and that which is bad and change it.”
To paraphrase, it means to me "Everyone is my teacher, in that I may learn from them" Be observant.
What words do you try to live by?