Letters 94.5

Those who urge the view that this department is superfluous argue as follows: “If an object that is held in front of the eyes interferes with the vision, it must be removed. For just as long as it is in the way, it is a waste of time to offer such precepts as these: ‘Walk thus and so; extend your hand in that direction.’ Similarly, when something blinds a man’s soul and hinders it from seeing a line of duty clearly, there is no use in advising him: ‘Live thus and so with your father, thus and so with your wife.’ For precepts will be of no avail while the mind is clouded with error; only when the cloud is dispersed will it be clear what one’s duty is in each case. Otherwise, you will merely be showing the sick man what he ought to do if he were well, instead of making him well.

Seneca, Letters to Lucilius 94.5, translated by Richard Mott Gummere