Letters 78.12

Moreover, every pain sometimes stops, or at any rate slackens; moreover, one may take precautions against its return, and, when it threatens, may check it by means of remedies. Every variety of pain has its premonitory symptoms; this is true, at any rate, of pain that is habitual and recurrent. One can endure the suffering which disease entails, if one has come to regard its results with scorn.

Seneca, Letters to Lucilius 78.12, translated by Richard Mott Gummere