Letters 104.14

Besides, it irritates us, through the wavering of a mind which is suffering from an acute attack of sickness; the very motion makes it more fitful and nervous. Hence the spots we had sought most eagerly we quit still more eagerly, like birds that flit and are off as soon as they have alighted.

Seneca, Letters to Lucilius 104.14, translated by Richard Mott Gummere