Preserve your energy - do not waste it on mediocre activity.
Knowledge is power. The more knowledge, expertise, and connections you have, the easier it is for you to make a profit at the game of your choice.
Life is so simple, really. Think through what people want, watch what others fail to give them, and provide it. Then bill'em.
The person who said money is the root of all evil just flat out didn't have any.
To win a moral victory at the expense of your sanity is dumb.
There is no amount of money in the world that will make you comfortable if you are not comfortable with yourself.