Text: In the famous speech which Emil du Bois-Reymond delivered in 1880, in the Leibnitz session of the Berlin Academy of Sciences, he distinquished seven world engimas, which he enumerated as follows: 1. The nature of matter and force. 2. The origin of motion. 3. The origin of life. 4. The (apparently preordained) orderly arrangement of nature. 5. The origin of simple sensation and consciousness. 6. Rational thought, and the origin of the cognate faculty, speech. 7. The question of the will. Three of these seven enigmas are considered by the orator of the Berlin Academy to be entirely transcendental and insoluble - they are the first, second and fifth; three others (the third, fourth and sixth) he considers to be capable of solution, though extremely difficult; as to the seventh and the last "world enigma", the freedom of the will, which is one of the greatest practical importance, he remains undecided.

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Source: 121