A well-spent day brings happy sleep.

No human investigation can be called real science if it cannot be demonstrated mathematically.

Learning is the only thing the mind never exhausts, never fears, and never regrets.

Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind.

The discovery of a good wine is increasingly better for mankind than the discovery of a new star.

Fix your course on a star and you'll navigate any storm.

Those who, in debate, appeal to their qualifications, argue from memory, not from understanding.