He will often have to scratch his head, and bite his nails to the quick. [To succeed he will have to puzzle his brains and work hard.]
Money amassed either serves us or rules us.
Get money; by just means. if you can; if not, still get money.
Necessity takes impartially the highest and the lowest.
He that has given today may, if he so please, take away tomorrow.
To marvel at nothing is just about the one and only thing, Numicius, that can make a man happy and keep him that way.