How to make observation serve you
Harvey Mackay
A famous surgeon used to tell his students that a doctor needed two abilities: freedom from nausea and the power of observation. Then he would dip his finger into a bitterly foul liquid, lick it off and ask each student to do the same.
One by one, the students would taste the liquid, many of whom almost gagged at the taste. Then he would say, "You have passed the first test, but not the second. For none of you noticed that while I dipped my first finger into the liquid, I licked the second."
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