Occasionally I read “my favorite quotes”-page …. it keeps me sharp !
Like this one :
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly ….
Specialization is for insects.
-Robert A. Heinlein
Wim Harwig 
Heinlein had a lot of insightful things to say. 🙂
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I love Heinlein and especially the quotes of Lazarus Long
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