This is a wonderful text. Exactly the way I aplied Child Dianetics to my kids - This book doesn't exist anymore in the Official Church of Scientology as it is too dangerous for them as when gently applied the kids are raised as independent beings that think for themselves.
Here the definition of audit:
1431, from L. auditus "a hearing," pp. of audire "hear" (see audience).
Official examination of accounts, which were originally oral.
The verb is attested from 1557.
Auditor id attested from 1377, from Anglo-Fr. auditour, from L. auditorem (nom. auditor) "a hearer," from auditus.