Only be strong and courageous

Joshua 1:12-18
Then Israelite answered Joshua, “Whatever you have commanded us we will do, and wherever you send us we will go. Just as we fully obeyed Moses, so we will obey you. Only may the Lord your God be with you as he was with Moses.
Only be strong and courageous! (v 6,7,9,18)
When Joshua commended them they all obey his commend and will obey Joshua as obeyed Moses.
Why?
Joshua followed Moses for a long time and is a good solider. He is the right man to be their leader.
Only be strong and courageous are said to me also to my proposal of agriculture console meeting tomorrow.
How?
God is with me, so only be strong and courageous!