Discourses on Livy

That to enjoy constant good fortune we must change with the times.

I have repeatedly noted that the good or bad fortune of men depends on whether their methods of acting accord with the character of the times. For we see that in what they do some men act impulsively, others warily and with caution. And because, from inability to preserve the just mean, they in both of these ways overstep the true limit, they commit mistakes in one direction or the other. He, however, will make fewest mistakes, and may expect to prosper most, who, while following the course to which nature inclines him, finds, as I have said, his method of acting in accordance with the times in which he lives.