Musar Avikha (Ethics of Your Father, a phrase from Proverbs 1:8) is an introductory work of musar by Rabbi Abraham Isaac HaCohen Kook, a leading figure in the development of the Religious Zionist movement at the turn of the 20th century. The book explores how to work on fear and service of God, character traits, and personal reflection. It was edited by Kook’s son, Rav Zvi Yehuda Kook and first published in 1946.