Rabbi Sidney Morgenbesser
[In Jewish ethics] can implies don't.
Rabbi Yisrael Salanter
It is easy to declare that God is king over the universe, but it is difficult to declare that God is king over oneself.
Rabbi Eliyahu Dessler, "Strive for Truth" / Michtav me-Eliyahu
Everybody has inside of themselves a "decision-point" (nekudat ha-bechira)
...אמר רבי אבא בר זבדא אע"פ שחטא ישראל הוא...
...Rabbi Abba bar Zavda says: From here it may be inferred that even when the Jewish people have sinned, they are still called “Israel.”...