Six Mistakes of Man by Cicero
1. The delusion that personal gain is made by crushing others.
2. The tendency to worry about things that cannot be changed or corrected.
3. Insisting that a thing is impossible because we cannot accomplish it.
4. Refusing to set aside trivial preferences.
5. Neglecting development and refinement of the mind, and not acquiring the habit of reading and studying.
6. Attempting to compel others to believe and live as we do.
Written a long time ago but still so very much applicable to this day and age. I guess that’s why they are considered great Philosophers in the first place because their thoughts are timeless and because they are such great forward thinkers.
I just have to inject this comment for no. 1 :
1. The delusion that personal gain is made by crushing others.
that one musn’t assume that those you want to crush won’t crush you back…. 
