John Calvin Commentary Joshua 23:9

"For Jehovah hath driven out from before you great nations and strong: but as for you, no man hath stood before you unto this day." — Joshua 23:9 (ASV)

For the Lord has driven out from before you, etc. He intimates that as long as they themselves do not change, there will certainly be no change on God's part. Therefore, he asserts that, provided they secure God's favor, they will have an uninterrupted course of victory. Finally, he again exhorts them, if they value their life and safety, to be careful to maintain love for God. From this source all true obedience springs; for if we do not cling to him with free and ardent affection, we will strive in vain to shape our lives according to the external form of the Law.