The fact that God started by saying to Joshua, “No man shall be able to stand before thee,” meant that he was going to encounter opposition in his new assignment. Yet God assured Joshua that he would prevail in the end as long as he stuck to meditation as a recipe for success (Joshua 1:8). Joshua only had to keep the Word of God in his mouth after meditating day and night. The Word of God would make him strong and courageous in the face of adversity.
No matter how fierce the battles and attacks of the enemy over any area of your life, keep speaking the Word out loud. Stay at it until it produces results. You will surely come back with a testimony!