When the water is stirred up by a storm, The mud from the lake's bottom clouds it, making it appear opaque. But the nature of the water is not dirty. When the storm passes, the mud settles and the water is left clear once again.
If we truly desire to be happy, there is no other way to proceed but by way of virtue: it is the method by which happiness is achieved. And, we might add, that the basis of virtue, its ground, is ethical discipline.