Does Hashem Prevent Tzadikim from Sinning?
Discussion of flattery and falsehood. The importance of having advisors who are willing to set you straight even when it is unpleasant.
Analysis of the principle of Hashem protecting tzadikim from failing.
Discussion of when the gemara invokes lo yi'uneh li-tzadik kol avven, versus the principle of "Behem tam shel tzadikim."
The importance of, and danger of, kana'us.
A classical Chassidic interpretation of "b'rovyo-etz."
Citations: Sefer Mesilas Yesharim 23rd chapter, Tosafos Shabbos 12b s.v. Rebbe, Gemara Kesubos 28b, Gemara Gittin 7a, Gemara Avodah Zarah 39a, Gemara Chullin 59a, Likkutei Moharan Torah #143.