This is a very awesone promise! I have found that it is not only important to be on guard but to practice for upcoming battles before they happen. Learn what your weak spots are then study the word to learn what is required so that you can recall those verses when you need them or the temptation is stronger. Also remenber to thank the father for the opportunity to overcome the obstacle in front of you. Just remember to never give up. Challenges build our faith and endurance. Successfully overcoming also feels really good.