Lack of money is no obstacle. Lack of an idea is an obstacle.
Preserving health by too severe a rule is a worrisome malady.
To be willing to die for an idea is to set a rather high price on conjecture.
Never hold discussions with the monkey when the organ grinder is in the room.
Better by far you should forget and smile than you should remember and be sad.
The world tolerates conceit from those who are successful, but not from anybody else.
When you make a mistake, don't look back at it long. Take the reason of the thing into your mind and then look forward. Mistakes are lessons of wisdom. The past cannot be changed. The future is yet in your power.