It is said that when the famous missionary, Dr. David Livingstone, started his trek across Africa he had 73 books in 3 packs, weighing 180 pounds.
After the party had gone 300 miles, Livingstone was obliged to throw away some of the books because of the fatigue of those carrying his baggage.
As he continued on his journey his library grew less and less, until he had but one book left--his Bible.