"I have operated on a few simple principles for more than two decades now, with good success.If that isn't a manifesto for every pre-mid-life-crisis-philosophical-assassin-poet out there then, gods damn it, I don't know what is.
First, do no harm. Or as little as possible.There is no meaning -- in anything -- but what our minds create. To search for meaning is to make the same mistake as those who search for happiness : both meaning and happiness are mental constructs superimposed by your mind on top of the actual conditions of your life. Seeking them in externals will drive you mad if you're smart, or guarantee you failure if you're persistent."
Second, do not suffer fools or Bad People. They will rob you of your life.
Third, make choices with an eye to minimize future regret. In other words, imagine you were on your deathbed looking back - live your life to make that old bastard as peaceful as possible about dying.
Fourth, learn and wander. We may or may not be hairless monkeys, but there is wisdom out there. It may be an evil world, but there is beauty. Find it.
Peace, love and chicken grease