God's ultimate concern is for our well being and our growth. By asking something of us and asking our obedience to His commandments he can fulfill both of those desires for us. As we surrender our agency to Him to obey His commandments our hearts are changed AND He is able to bless us as a result. Really when it comes down to it there are very few things we have to give God that are really our own. Our agency, and our gratitude. As we humble ourselves and show our gratitude to Him, we draw closer to Him.