John Calvin Commentary Joshua 4:24

"that all the peoples of the earth may know the hand of Jehovah, that it is mighty; that ye may fear Jehovah your God for ever." — Joshua 4:24 (ASV)

That all people of the earth might know, etc. He states that God displayed this manifestation of His power so that it might not only be proclaimed among His own people, but also that the report of it might spread far and wide among the nations. For although it pleased Him that His praise should dwell in Zion, it also pleased Him that His works should be made known to strangers to such an extent that they would be forced to confess that He is the true God, and compelled unwillingly to fear Him whom they had willingly despised, as it is said in the song of Moses (Deuteronomy 32:31), Our enemies are judges.

For he means that unbelievers, whether they want to or not, have this confession extorted from them by a knowledge of God’s works. But since it did not profit them at all to know how great God’s power was, Joshua distinguishes them from the Israelites, to whom he attributes a special knowledge—namely, that which produces a serious fear of God. That the nations may know, he says, but that you may fear your God.

Therefore, while unbelievers extinguish the light by their darkness, let us learn from considering God’s works to advance in His fear. He says all days, because the favor spoken of here was diffused over several generations.