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A man only learns in two ways, one by reading, and the other by association with smarter people

We never fully grasp the import of any true statement until we have a clear notion of what the opposite untrue statement would be.

The men who learn endurance, are they who call the whole world brother

If merely 'feeling good' could decide, drunkenness would be the supremely valid human experience.

You do not really understand something unless you can explain it to your grandmother

In youth we learn; in age we understand