Why Avraham left the city of Haran at the age of 75:^[1]

Avraham was 75 years old when he left the city of Charan. The Kabbalistic meaning behind this is as follows: Our psyche was built by G-d in a way that there is a bridge between our mind and our hearts, to transfer the intellectual comprehensions of the mind into the heart for the sake of creating emotions that are in tune with the intellectual conclusion. For example, the bridge between the mind and the heart helps translate one’s comprehension of G-d’s greatness into a tangible feeling of passion in the heart. Now, this bridge is very narrow and is represented by the neck which indeed is the physical medium between the brain which is housed in the head and the heart which is housed in the chest. The period in which the intellect is traveling through the bridge on its way to the heart is referred to by the title of “Charan” which literally means wrath [as in this area there is neither intellect nor emotions], as it has already descended from its high sublime level of intellect and has yet to reach the emotions. This is then the spiritual meaning behind Avraham’s travels at the age of 75. The journey itself represents the travel of the level of intellect, which is represented in Avram’s name which means Av Ram- sublime intellect, into the level of emotion. Now this journey takes 75 years, as seven represents the seven emotional attributes times 10, being that each attribute is incorporated of 10 parts, for a total of 70. The other five represents the five aspects of kindness, for a total of 75. It is only when all these aspects came to a completion that Avraham was finally able to bring his intellect into a translated emotion.

[1] Torah Or 11b