“Be strong and courageous, for you shall cause this people to inherit the land that I swore to their fathers to give them. Only be strong and very courageous, being careful to do according to all the law that Moses my servant commanded you. Do not turn from it to the right hand or to the left, that you may have good success wherever you go. This Book of the Law shall not depart from your mouth, but you shall meditate on it day and night, so that you may be careful to do according to all that is written in it. For then you will make your way prosperous, and then you will have good success. Have I not commanded you? Be strong and courageous. Do not be frightened, and do not be dismayed, for the LORD your God is with you wherever you go."
I've read this verse so many times, and this is nothing that someone hasn't probably already said; but sometimes the same words can strike me in a new way.
God calls us to follow Him. He leads us into strange and new places where we will be challenged by new circumstances, by enemies, and by our own weakness. He knows we are frail. He knows we will get scared. Just like He knew the children of Israel would. I wonder if Joshua felt apprehensive and inadequate for the job ahead. God uses the phrase "be strong and courageous" 3 times. I think He really wanted Joshua (and us) to take this to heart. When we do as He commands, when we walk in His ways, God will be with us. Always. And we have NOTHING to fear. Jesus will win the day.