These stones are to be a memorial to the people of Israel forever

Joshua 4:1-14
These stones are to be a memorial to the people of Israel forever.
About forty thousand armed for battle crossed over before the Lord to the plains of Jericho for war.
That day the Lord exalted Joshua in the sight of all Israel; and they stood in awe of him all the days of his life, just as they had stood in awe of Moses.
To commemorate the crossing for ever after, stones are taken from the river-bed, 12 to mark the place where the priests had stood, and 12 to mark the Israelites' first base-camp in the new land, at Gilgal.
Joshua's action in leading the people across the Jordan parallels Moses' crossing of the Red Sea: his position is established, and the nation honors him.
None of the adults who had made the Red Sea crossing, apart from Joshua and Caleb, lived to cross the Jordan.
Why?
God's leading step by step has his wonderful plain and right way. God let Joshua be honored before him, so Joshua has the power and reputation to lead Israelite..
Remember what God has done to us, so we can has faith to Him.
How?
Praise to the Lord! Remember God has love and mercy to me!