Contemplate
What is your experience of sincerity so far? When was the last time you encountered it and what happened?
Practice of the Week
Start an sincerity journal to review whether you made any inner justifications to yourself over the day (or week). Maybe you made an excuse to yourself about skipping yoga practice or missing a deadline for work. At the end of the month review the entries to see if there are any patterns emerging. In this way the journal can be a mirror to help you see your insincerities.