In the Musar movement of Rav Israel Salanter, Fear of God was a major goal. I noticed today in the local Breslov shul a Torah lesson of Rav Nahman that echoes that point. He say that by bringing up Fear of God to its roots one merits to the secrets of Torah.  And he explains to bring "fear of God up" to mean not to be afraid of lower things but of God alone. In fact when I was in Uman I noticed a lot of Torah lessons of Rav Nahman revolved on the theme of fear of God  and from that I decided to dig more deeply into Musar. 

I have in my own life seen that fear of God is can be gained and lost and once lost does not come back easily. Even learning Musar does not seems to help a lot. It is as if the hand of the  fates is over one in such a way that regaining lost levels is against the grain.

On one hand learning Musar seems to be the only way to gain any idea of authentic Torah and to gain at first fear of God. But there is a sort of way of falling from that that does not return.