All our knowledge has its origin in our perceptions - "Leonardo Da Vinci"

All our knowledge has its origin in our perceptions
Leonardo Da Vinci

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Study without desire spoils the memory and it retains nothing that it takes in.
- Leonardo Da Vinci
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Learning acquired in youth arrests the evil of old age; and if you understand that old age has wisdom for its food, you will so conduct yourself in youth that your old age will not lack for nourishment.
- Leonardo Da Vinci