Niccolò Machiavelli Rule of Thumb

There is nothing more difficult to carry out, nor more doubtful of success, nor more dangerous to handle than to initiate a new order of things ... for the reformer has enemies in all who profit by the old order, and only luke warm defenders in all those who profit by the new order ... this luke warmness arises partly from the incredulity of mankind, who do not truly believe in anything new until they actually experience it!