It is no harm to accept an invitation of a stranger,
but better visit an occasion of people we know well.

Someday, men will visit ideas instead of places.

Facing alien race has a common approach with facing a stranger. Do not be pretentious familiar!

A well-trained mind directs circumstance.

A well-trained mind responded to symptoms.
An ordinary mind reacted after it happened.

We should have known much more than our ancestors.
But if we learn less, we're much more stupid than them.