Francesco Guicciardini — Italian Historian born on March 06, 1483, died on May 22, 1540

Francesco Guicciardini was an Italian historian and statesman. A friend and critic of Niccolò Machiavelli, he is considered one of the major political writers of the Italian Renaissance. In his masterpiece, The History of Italy, Guicciardini paved the way for a new style in historiography with his use of government sources to support arguments and the realistic analysis of the people and events of his time... (wikipedia)

It is a great matter to be in authority over others; for authority, if it be rightly used, will make you feared beyond your actual resources.
Since there is nothing so well worth having as friends, never lose a chance to make them.
There is nothing so fleeting as the memory of benefits received.
If you attempt certain things at the right time, they are easy to accomplish - in fact, they almost get done by themselves. If you undertake them before the time is right, not only will they fail, but they will often become impossible to accomplish even when the time would have been right.
Waste no time with revolutions that do not remove the causes of your complaints but simply change the faces of those in charge.