Life can only be understood backwards; but it must be lived forwards.
— Soren Kierkegaard
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We are what we repeatedly do; excellence, then, is not an act, but a habit.
— Aristotle
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When something can be read without effort, great effort has gone into its writing.
— Enrique Jardiel Poncela
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Every gun that is made, every warship launched, every rocket fired signifies, in the final sense, a theft from those who hunger and are not fed, those who are cold and are not clothed.
— Dwight D. Eisenhower
Kierkegaard
Eisenhower
Mr. Write's Page 
Wow. That Eisenhower quote is really powerful.
The Aristotle quote reminds me of one I jotted down earlier this week:
As a single footstep will not make a path on the earth, so a single thought will not make a pathway in the mind. To make a deep physical path, we walk again and again. To make a deep mental path, we must think over and over the kind of thoughts we wish to dominate our lives.
–Thoreau
Wish I could come up with deep thoughts like those guys.