Austerity of body, austerity of mind & austerity of speech are critical for aspiring leaders. Bhishma Deva’s advice for ensuring that is shared in Srimad Bhagavatam:
To get freedom from anger, one should learn how to forgive.
To be free from unlawful desires one should not make plans.
By spiritual culture one is able to conquer sleep.
By tolerance only can one conquer desires and avarice.
Disturbances from various diseases can be avoided by regulated diets.
By self-control one can be free from false hopes.
Money can be saved by avoiding undesirable association.
By practice of yoga one can control hunger.
Worldliness can be avoided by culturing the knowledge of impermanence.
Dizziness can be conquered by rising up.
False arguments can be conquered by factual ascertainment.
Talkativeness can be avoided by gravity and silence.
By prowess one can avoid fearfulness.
Perfect knowledge can be obtained by self-cultivation.
(Srimad-Bhagavatam 1.9.27 Purport)