Being impeccable with your word is the correct use of your energy; it means to use your energy in the direction of truth and love for yourself. 

Don Miguel Ruiz was born into a family of Healers and raised in rural Mexico however chose medical school and became a surgeon. However, in a near death situation he has an out of body experience which changes the course of his life and begins to study the ancient wisdom of the Toltecs,

His words have a profound life changing simplicity.