11. Never excuse yourself except in grave matters.5 12. On no account mention anything to your own credit, such as learning, good points or lineage, except with the hope of doing some good by it: then, speak humbly, remembering that such things are God’s gift. 13. Do not exaggerate, but state your opinion humbly. 14. Introduce religious topics into all your talk and interviews, which will prevent idle gossip and detraction.6 15. Never affirm anything of the truth of which you are uncertain. 16.