self-command

self- +‎ command

self-command (uncountable)

1. The conscious control of one's own behaviour.
   • 1815, Jane Austen, Emma, volume II, chapter 13:

     I would wish it to be done, for the sake of what is more important than my comfort, a habit of self-command in you, a consideration of what is your duty, an attention to propriety, an endeavour to avoid the suspicions of others, to save your health and credit, and restore your tranquillity.