O that you would altogether hold your peace! and it should be your wisdom.
Read Chapter 13
Didymus the Blind
AD 398
A worthless physician is literally one who applies curing strategies that are not useful for the suffering. This happens in two ways: either it is due to lack of experience in the physician or to his wickedness. The friends who are contradicted here speak out of a lack of knowledge rather than wickedness in saying, “You suffer due to your sins.” They think they are bringing words of comfort. They were worthless physicians since they did not discover the true reason. “Whitewash with lies,” Job says against them, who think highly of themselves as if they could cure the affliction that occurs in others. He wishes that they had knowledge of the right times, to speak when it is appropriate and to be silent when it is appropriate, since they have realized their mistake. For that would be the beginning and commencement of wisdom for them. For once they learn that one can also be suffering for a different reason, namely, for inherent virtue to become visible, then Job’s friends will possess wi...
35. As in a house, when the door is shut, it is not known what members there are hidden within, so, generally speaking, if a fool hold his peace, it is hidden whether he be wise or foolish, only, however, if no other works come to light, which may speak the mind even of one that is silent. For this reason the holy man, seeing that his friends were anxious to appear what they were not, charged them to hold their peace, that they might not appear what they were. And hence it is said by Solomon; Even a fool when he holdeth his peace is counted wise. [Prov. 17, 28] But because when a fool speaks, from this, that he brings in his own words, he is unable to reflect on the words of the wise, after he had bidden silence.
Indeed, when senseless words are spoken, it is better to remain in silence, and in being silent, one will show greater wisdom than in speaking. - "Commentary on Job 13.4–5"