One who imitates what is bad always goes beyond his model; while one who imitates what is good always comes up short of it.
Other quotes by Francesco Guicciardini
Conspiracies, since they cannot be engaged in without the fellowship of others, are for that reason most perilous; for as most men are either fools or knaves, we run excessive risk in making such folk our companions.
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.