Gregory the Dialogist

But now it is come upon thee, and thou faintest: it toucheth thee, and thou art troubled. All men of froward mind assail the life of the righteous in two ways; for either they assert that what they say is wrong, or that what they say aright they never observe; and hence blessed Job is reproved by his friends further on for his mode of speech, whereas now he is torn in pieces for having spoken right things, but not having observed them. …

Morals on the Book of Job, Book V ↗

Thomas Aquinas

Eliphaz wants to show as a consequence that Job did not practice the things he taught others and so he continues, "But now a trial has come to you, and you too have fallen away," namely, from the firmness of mind which you seemed to have and which you recommended to others. This refers to the adversity he had suffered in exterior things. "It touched you, and you are dismayed," i.e. you have lost the peace of mind which you seemed to have. This refers to the affliction of body he was suffering. …

Commentary on Job ↗