I have picked out the older ones with contemporary relevance
The Roman poet Horace on always longing to be whereve you are not:
In Rome you long for the country; in the country – oh inconstant! – you praise the distant city to the stars. – Horace
Henry Wadsworth Longfellow on the comfort that comes from proximity to one’s fellow man:
I have an affection for a great city. I feel safe in the neighborhood of man, and enjoy the sweet security of the streets.
Historian Arnold Toynbee on the virtues of walkability:
A city that outdistances man’s walking powers is a trap for man.
Plato on economic inequality:
Any city however small, is in fact divided into two, one the city of the poor, the other of the rich. These are at war with one another. – Plato