Do princes have have to possess all the good qualities to be successful?

"A prince need not possess all the virtues listed in Chapter XV. He need not be giving, merciful, faithful, spirited, humane, chaste, straightforward, gentle, but he needs to seem to possess these virtues. Admittedly, it is good to follow virtues both in appearance and in reality, but a prince must be able to switch to the contrary at a moment’s notice if necessary, while maintaining a consistent front."