I have been a kind of follower about the idea of Fear of God ever since I read about it in a book by Isaac Blaser --a major disciple of Israel Salanter.
This is something you really have to see his book to get a taste for. Ever since then the whole idea has gone up and down in stages for me.
To just to try to make it clear to people what I am talking about let me explain that to Isaac Blaser fear of God is the Dinge An Sich [the thing in itself].
But that original reading of Musar started a whole train of events. I read then the major corpus of the books of Musar [the Famous Five: Duties of the Heart, Gates of Repentance, Mesilat Yesharim (by Moshe Lutzato), Sefer HaMidot, and Orchot Tzadikim (Paths of the Righteous)]. That led me eventually to notice that a lot of the books of Musar were in fact telling people to learn Kabalah. (That is most Renaissance books of Musar.) And that got me started on the Tree of Life of Isaac Luria.
He said that it relates to length of days. He said that when a day starts for most people it is short. There are lots of things to do and not enough time to do them. He said this in a context of learning Torah and doing mitzvot, but I suppose it applies in wider area of a polynomic realm of values also. [note 1]
So when I saw my days were in fact getting shorter. I was spending way too much time doing things that I knew were just plain a waste of time. I got a wake up call and realized that I had wandered too far from the path of Fear of God; and Musar.
I would like here to suggest that the idea of length of days also applies in a physical manner. I.e. that the door way to length of days can be found in books of Musar [Fear of God.] That is instead of the over emphasis on doctors and medicine I would suggest to people that have physical aliments that they also should work on Fear of God solutions. [Or to put it more bluntly--to go out a buy the regular Musar books and read them--out loud, word after word, until you get to the end and then start again.]
[Also, I should mention that the general Musar corpus has expanded to include books like the Nefesh Hachahim by Reb Chaim from Volloshin and the Madgragat HaAdam by the Alter of Navardok. The more recent ones you might like more and you might like less, but they still contain that spark of Fear of God which is the Dinge an Sich!]
[note 1] Everyone it seems has some kind of problem with length of days issues. It does not matter if you are a movie producer, or a theoretical physicist, or the general secretary of the Communist Party in China. Half your days are spent on complete waste of time things, and the other half seems to get nowhere- even when you are doing what you know is right.
You try to do physics, and then you get to university and then you discover papers to be graded and other varieties of wasted time. Even if you are a fireman, you find this. [This hit me in particular when I went to Polytechnic University of NYU. The amounts of wasted time were enormous. I am sure everyone knows exactly what I am talking about and how it applies in their own lives.]