Niccolo Machiavelli

One change always leaves the way open for the establishment of others.

Whosoever desires constant success must change his conduct with the times.

Men are so simple and yield so readily to the desires of the moment that he who will trick will always find another who will suffer to be tricked.

The one who adapts his policy to the times prospers, and likewise that the one whose policy clashes with the demands of the times does not.

The fact is that a man who wants to act virtuously in every way necessarily comes to grief among so many who are not virtuous.

Hatred is gained as much by good works as by evil.