Letters 94.14

Besides, if we give forth precepts to each individual, the task is stupendous. For one class of advice should be given to the financier, another to the farmer, another to the business man, another to one who cultivates the good graces of royalty, another to him who will seek the friendship of his equals, another to him who will court those of lower rank.

Seneca, Letters to Lucilius 94.14, translated by Richard Mott Gummere