MARCUS: But there are more disorders of the mind than of the body, and they are of a more dangerous nature.

[At et morbi perniciosiores pluresque sunt animi quam corporis; hi enim ipsi odiosi sunt.]

Marcus Tullius Cicero (106–43 BC) Roman orator, statesman, philosopher

Tusculan Disputations [Tusculanae Disputationes], Book 3, ch. 3 (3.3) / sec. 5 (3.5) (45 BC) [tr. Yonge (1853)]
    (Source)

(Source (Latin)). Other translations:

Whereas, in truth, there are more and more dangerous Diseases of the Soul, than of the Body.
[tr. Wase (1643)]

But there are more disorders of the mind than of the body, for the generality, and of a more severe nature.
[tr. Main (1824)]

The diseases of the mind are more pernicious, as well as more numerous, than those of the body.
[tr. Otis (1839)]

But there are more harmful disorders of the soul than of the body, and more of them.
[tr. Peabody (1886)]

The diseases of the mind are more destructive and in greater number than those of the body.
[tr. Taylor/Hunt (1916)]

No, the sicknesses of the mind are both more destructive and more numerous than those of the body.
[tr. Graver (2002)]