Meaning for quote the man whose authority is recent is always stern?

Answer 1

That sounds like it would mean that people who fall into power will soon after act strict in excercising that power. An example would be a rookie cop, who will almost always issue a ticket.

Answer 2

This quote suggests that someone who has newly obtained power or authority tends to be strict or severe in their enforcement of rules to establish their dominance. Essentially, they are eager to assert their control and may do so in a harsh or unforgiving manner.