Meditations - as mentioned by others. I pick that one up several times each year.
Letters from a stoic - by Seneca. In the same league as Meditations.
The way of the superior man - by David Deida. I only think I have finished it once, but read the first half close to 10 times. Whenever I feel down, lost or exhausted the first half of that book gets me to man up and fill with energy. The latter half never really caught my attention.
The obstacle is the way - by Ryan Holiday. I have only read it once, but I am absolutely certain that I will return to it over and over again. A obvious choice for a once-each-year book.
Letters from a stoic - by Seneca. In the same league as Meditations.
The way of the superior man - by David Deida. I only think I have finished it once, but read the first half close to 10 times. Whenever I feel down, lost or exhausted the first half of that book gets me to man up and fill with energy. The latter half never really caught my attention.
The obstacle is the way - by Ryan Holiday. I have only read it once, but I am absolutely certain that I will return to it over and over again. A obvious choice for a once-each-year book.