Working on Oneself in Calm
A teaching ofRav Yisrael Lipkinהרב ישראל בן זאב וואלף ליפקין
Rav Yisrael taught that the time to work on improper impulses is a time of emotional quiet, when a person is in control of his thoughts and feelings. In the middle of a strong emotional reaction, he said, a person may not have the calming perspective he needs.
Source: Teachings of Rav Yisrael Salanter