In selling these books the youth would be acting as missionaries, for they would be bringing precious light to the notice of the people of the world. At the same time they would be earning money to enable them to attend school, where they could continue their preparation for wider usefulness in the Lord’s cause. In the school they would receive encouragement and inspiration from teachers and students to continue their work of selling books; and when the time came for them to leave school, they would have received a practical training fitting them for the hard, earnest, self-sacrificing labor that has to be done in many foreign fields, where the third angel’s message must be carried under difficult and trying circumstances.