Letters 71.30

The wise man, indeed, overcomes Fortune by his virtue, but many who profess wisdom are sometimes frightened by the most unsubstantial threats. And at this stage it is a mistake on our part to make the same demands upon the wise man and upon the learner. I still exhort myself to do that which I recommend; but my exhortations are not yet followed. And even if this were the case, I should not have these principles so ready for practice, or so well trained, that they would rush to my assistance in every crisis.

Seneca, Letters to Lucilius 71.30, translated by Richard Mott Gummere