"As a splendid palace deserted by its inmates looks like a ruin, so does a man without character, all his material belongings notwithstanding."

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1. 0 is a number. 2. The immediate successor of a number is also a number. 3. 0 is not the immediate successor of any number. 4. No two numbers have the same immediate successor. 5. Any property belonging to 0 and to the immediate successor of any number that also has that property belongs to all numbers.

— Giuseppe Peano