“Go from your country and your kindred and your father’s house to the land that I will show you.”
This is an invitation to put one’s security entirely in God’s hands, renouncing past (the country of Ur, which they had already left), present (kindred: our accustomed place in the fabric of society) and future (father’s house: our hoped-for inheritance). This demonstrates that the ‘land that I will show you’ ultimately refers not to Canaan, but to our heavenly homeland, outside of the succession of time in the present age.