[tankmohit11]

Read The Meditations by Marcus Aurelius. It is available for free online. It's straight to the point. Each line of this book can be used as a quote.

Other books I found without filler is 48 laws of power. It is a also a good read.

[unmole]

I would actually suggest buying the Hays translation of Meditations instead of reading the free versions. The language in every other version is overly verbose and archaic.

[kashyapc]

Indeed, I agree. I'm ~70% through the translation by Gregory Hays. FWIW I've picked up this translation after some research; there are several of them. Hays' translation also as a nice reference on related reading in the book's introduction chapter.

[mpax]

Laws of power is nice but what always bothered me about it is that there doesn’t seem to be a system to the laws, it merely sums up a bunch of them without investigating underlaying foundations.