I Kings 5:9 My servants shall bring them down from Lebanon unto the sea: and I will convey them by sea in floats unto the place that thou shalt appoint me, and will cause them to be discharged there, and thou shalt receive them: and thou shalt accomplish my desire, in giving food for my household.
Doing Salomon’s desire with the timber would cause his desire to be accomplished in feeding his family. That is exactly how it works in the things of God. We do His desire in serving Him, giving, evangelizing the world, etc. and He accomplishes our desire of meeting our needs, giving us a life of purpose and passion, and allowing us to participate in His great work.
Faith promise mission works much the same way. Our giving meets God’s desire and the missionary’s desire and burden to get the gospel to the world while accomplishing our desire to have God meet our needs, bless our church, and use us for eternal purposes. He gives us great joy in serving Him.