Just as iron rusts from disuse, even so does inaction spoil the intellect.
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- Iron rusts from disuse, stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigors of the mind.
- Learning never exhausts the mind.
- The noblest pleasure is the joy of understanding.
- Nothing can be love or hated unless it is first known.
- Time stays long enough for those who use it.
- I roamed the countryside searching for answers to things I did not understand. Why thunder lasts longer than that which causes it, and why immediately on its creation the lightning becomes visible to the eye while thunder requires time to travel. How the various circles of water form around the spot which has been struck by a stone and why a bird sustains itself in the air. These questions and other strange phenomena engaged my thought throughout my life.