There are many retirement books in the library. One might feel motivated after reading some of these books. There are also materials online in which one can pay a certain amount of money to obtain such FIRE books I have instances in which I do not feel any different after reading these books. I wonder how I lose the motivation of FIRE through reading these books. I believe that this is quite common in term of the feelings after experiencing the almost similar circumstances of reading the books.
It is entirely up to one to charter the FIRE journey. The motivation is sustainable through self-belief and motivation. I guess that one will have to make himself/herself motivated on a constant basis.