Choose - Service of God in sincerity and truth can only result from a free and willing allegiance of the heart. This accordingly is what Joshua invites, as Moses had done before him (Deuteronomy 30:15 ff).
Related Commentaries of Joshua 24:15
Joshua 24:15
15 And if it seem evil unto you to serve the LORD, choose you this day whom ye will serve; whether the gods which your fathers served that were on the other side of the flood, or the gods of the Amorites, in whose land ye dwell: but as for me and my house, we will serve the LORD.