Psychology
- Niccolò Machiavelli, Discourses on Livy, Book I, Chapter III – What Kind of Events Gave Rise in Rome to the Creation of Tribunes of the Plebs, Whereby that Republic was Made More Perfect: "Men never do good unless necessity drives them to it; but when they are too..."
- Carl Jung, Aion, Chapter IV.58: "Intellect and feeling, however, are difficult to put into one harness -- they conflict with..."