XXV+-+WHAT+FORTUNE+CAN+EFFECT+IN+HUMAN+AFFAIRS,+AND+HOW+TO+WITHSTAND+HER

When a prince doesn't discern between flattery and good advice his ego will build up causing a secret place of beliving that he can do all things in his own power without asking for advice.

"I say that one sees a given prince be happy today and come to ruin tomorrow without having seen him chang his nature or any quality. This I belive arises, first, from the causes that have been discussed at length in the preceding, that is, tht the prince who leans entirely on his own fortune comes to ruin as it varies."

Machiavelli is strenghthening his argurment in the previous chapters by showing the destruction that can come out of being in power and not taking advice in.