I think we must quote whenever we feel that the allusion is interesting or helpful or amusing.

We are all citizens of history.

Socrates called himself a midwife of ideas. A great book is often such a midwife, delivering to full existence what has been coiled like an embryo in the dark, silent depths of the brain.

A man who is careful with his palate is not likely to be careless with his paragraphs.

The drinking of wine seems to me to have a moral edge over many pleasures and hobbies in that it promotes love of one's neighbor.

When you travel, remember that a foreign country is not designed to make you comfortable. It is designed to make its own people comfortable.

Dr. Seuss provided "ingenious and uniquely witty solutions to the standing problem of the juvenile fantasy writer: how to find, not another Alice, but another rabbit hole.