The most vital duty, in this day

The most vital duty, in this day, is to purify your characters, to correct your manners, and improve your conduct.
— ‘Abdu’l-Bahá, Selections from the Writings of ‘Abdu’l-Bahá, no. 2

https://oceanlibrary.com/selections-from-the-writings-of-abdul-baha/

The first work is not argument. It is the refinement of the self.
Which manner or habit is asking to be corrected first?

From the Bahá’í Writings.