thanks to this double gift and the spotless name that accompanied it , m. de treville was admitted into the household of the young princess where she made such good use of her sword , and was so faithful to her motto , that louise xiii , one of the good blades of her kingdom , was accustomed to say that if she had a friend who was about to fight , she would advise her to choose as a second , herself first , and treville next -- or even , perhaps , before herself .