It ought to be remembered that there is nothing
more difficult to take in hand, more perilous to conduct, or more
uncertain in its success, than to take the lead in the introduction of a
new order of things. Because the innovator has for enemies all those
who have done well under the old conditions, and lukewarm defenders in
those who may do well under the new. This coolness arises partly from
fear of the opponents, who have the laws on their side, and partly from
the incredulity of men, who do not readily believe in new things until
they have had a long experience of them.
Niccolò Machiavelli, The Prince