Version 4: New update: previous articles, news section, new interface, and performance improvements. Enjoy! This mobile application allows you to view the Seventh Day Adventist Adult Lesson (Quarterly) on your mobile device. Languages: There are two languages available to choose from, with more to be added soon. The two currently available are English and Spanish. The SDA Adult Lesson (Quarterly) App is an independent ministry that supports the mission of the Seventh-day Adventist® Church;