It should be borne in mind that there is nothing more difficult to arrange, more doubtful of success, and more dangerous to carry through than initiating changes. The innovator makes enemies of all those who prospered under the old order, and only lukewarm support is forthcoming from those who would prosper under the new. Their support is lukewarm ... partly because men are generally incredulous, never really trusting new things unless they have tested them by experience.
Whosoever desires constant success must change his conduct with the times.
The reformer has enemies in all who profit by the old order, and only lukewarm defenders in all those who would profit by the new order.
One change always leaves the way open for the establishment of others.
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.