Sutta Nipata - Who is your worst enemy?

Your worst enemy cannot harm you as much as your own unguarded
thoughts.
Sutta Nipata

Norwid on Happiness

To be what is called happy, one should have
(1) something to live on, (2) something to live for, (3) something to
die for.
The lack of one of these results in drama. The lack of two results in
tragedy.

/Cyprian Norwid (19^th century Polish poet)/