Between a tyrant and a prince ...

Between a tyrant and a prince there is this single or chief difference, that the latter obeys the law and rules the people by its dictates, accounting himself as but their servant.
 John of Salisbury

Quotes from the same author

A man is free in proportion to the measure of his virtues, and the extent to which he is free determines what his virtues can accomplish.
 John of Salisbury
Accurate reading on a wide range of subjects makes the scholar; careful selection of the better makes the saint.
 John of Salisbury