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There is no more difficult art to acquire than the art of observation, and for some men it is quite as difficult to record an observation in brief and plain language.
The good physician treats the disease the great physician treats the patient who has the disease.
Observe, record, tabulate, communicate. Use your five senses. Learn to see, learn to hear, learn to feel, learn to smell, and know that by practice alone you can become expert.
In seeking absolute truth we aim at the unattainable and must be content with broken portions.