Deuteronomy 1:21

See, the LORD your God has given you the land. Go up and take possession of it as the LORD, the God of your fathers, told you. Do not be afraid; do not be discouraged.
(Deuteronomy 1:21, New International Version)

A word of encouragement is indispensable at the start of a new journey, especially when the journey demands your leadership. Joshua is no longer second chair. He is no longer the backup to all-pro Moses. Now it is his turn to lead. The people he leads have only known the leadership of the incomparable Moses. How will he lead? He will lead trusting the promises of God and without fear or discouragement! How is this possible? Because the real leader of God's people hasn't really changed! God is still God. His word is still true. His promises are still trustworthy. His might is still all-powerful.