"A return to first principles in a republic is sometimes caused by the simple virtues of one man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example"

In this quote, Machiavelli recommends that a republic (presumably a government based upon democratic principles) can be enhanced and enhanced by the impact of an individual who embodies "easy virtues" and sets a fine example for others to follow. This person's behavior and values can motivate others to mimic him or her, while also triggering the "wicked" to feel embarrassed of their own behaviors that differ from the example set by the virtuous individual. In general, this quote recommends that the behavior and values of individuals can have a considerable influence on the working and morality of a democratic society.