17. (a) What is the specific purpose of each study book? (b) What is required of all those who advance to baptism, and why?
17. (a) Buka nngwe le nngwe ya go ithuta e diretswe go thusa motho jang? (b) Batho ba ba batlang go kolobediwa ba tshwanetse go dira eng mme ka ntlha yang?