The happiness of this life depends less on what befalls you than the way in which you take it.
The greatest mistake you can make in life is continually fearing that you’ll make one.
The recipe for perpetual ignorance is: Be satisfied with your opinions and content with your knowledge.
The only foes that threaten America are the enemies at home, and these are ignorance, superstition and incompetence.
A retentive memory may be a good thing, but the ability to forget is the true token of greatness.