There are two kinds of ...

There are two kinds of discontented in this world, the discontented that works and the discontented that wrings its hands. The first gets what it wants and the second loses what it has. There is no cure for the first but success and there is no cure at all for the second. The very worst of my vices and bad habits will abate of themselves if they are brought to an accounting every day.
There are two kinds of discontented in this world, the discontented that works and the discontented that wrings its hands. The first gets what it wants and the second loses what it has. There is no cure for the first but success and there is no cure at all for the second. The very worst of my vices and bad habits will abate of themselves if they are brought to an accounting every day.

Quotes from the same author

Each misfortune you encounter will carry in it the seed of tomorrows good luck.
Beginning today, treat everyone you meet as if they were going to be dead by midnight. Extend to them all the care, kindness and understanding you can muster, and do it with no thought of any reward. Your life will never be the same again.
I seek constantly to improve my manners and graces, for they are the sugar to which all are attracted.
Failure will never overtake me if my determination to succeed is strong enough.
Do all things with love.